Is there a link between CTE brain disease and violent crime?
When Noah Green, a 25-year-old with no known history of violence, crashed his car into a barricade at the Capitol building in Washington DC, killing one police officer, before lunging at others with a knife, his own family were grappling for answers.
“My heart just sank,” his mother, Mazie Green, tells me. It was a murder, which, on the face of it, had nothing to do with American football.
But three years on and speaking publicly for the first time since that day, Mazie says she now believes it has everything to do with American football.
Noah Green’s car after he rammed into a barricade at the Capitol building in Washington DC
Green was shot dead by responding police, and in the days after the killing the FBI recommended that Mazie submit Noah’s brain to be analysed.
The diagnosis came back months later, indicating Green had stage one Chronic Traumatic Encephalopathy, more commonly known as CTE.
It’s a brain disease caused by repetitive blows to the head and it afflicts participants of contact sport, including American football. Symptoms include aggression, paranoia and problems controlling impulses.
Noah Green with mother Mazie and his father
Noah and Mazie
“Noah took big hits,” Mazie says. At Alleghany High School in rural Virginia, Green had played in defence and was voted most valuable player and he later played for Christopher Newport University.
Teammates recall him being dependable and good-natured but Mazie says she noticed changes after he suffered several head injuries.
“He wanted to be tough, to prove himself,” Mazie says, “But there were changes. He would start wearing blankets around his head and I thought it was a teenage thing, but it was because he was so sensitive to the light. Then he would lose his keys and he forgot how to cook, prepare his meals.
“After that, he started with these really bad headaches. One day he said ‘I don’t know what’s wrong with me, mum, I’ve lost 20 pounds…. I feel like I need to leave. I’ve got to get out of the country. They’re going to kill me, the FBI, they’re going to kill me.’
“He was paranoid.”
Mazie Green
Officer William Evans, the police officer who Noah Green killed, left behind two young children. I ask Mazie if she has any message for his family.
“Officer Evans should not have died that day,” she says, “Noah should not have died that day. Someone has to take the responsibility for telling parents what to do if something’s just not quite right with those kids that are out there playing football for entertainment.”
Shannon Terranova, the former spouse of Officer Evans and mother of his two young children, said: “I want to be mindful of all who are impacted by this real-life horror; but it is difficult for me to comprehend any rationalisation of what happened to Billy and the events that led up to his death. I appreciate the efforts in bringing awareness to the long-term implications of bodily trauma caused by sports injuries. However, nothing can justify what Billy’s co-workers and family experienced, saw, and felt on April 2 2021, and every day since.”
Christopher Newport University declined to comment on Noah Green’s case. Alleghany High School did not respond to Sky News’s request for comment.
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How CTE is diagnosed
The casket of US Capitol Police officer William “Billy” Evans. Pic: AP
The question over whether CTE is linked to violent crime has come to the fore after numerous incidents of violent ex-football players.
Former San Francisco 49ers star Phillip Adams shot dead six people in an explosion of violence in 2021.
He murdered doctor Robert Lesslie, his wife, Barbara Lesslie, and two of their grandchildren, Adah, 9, and Noah, 5 at their home in South Carolina.
He also killed James Lewis and Robert Shook, who were working on an air conditioning unit at the house. Analysis of Adams’ brain showed he had severe CTE.
Phillip Adams. Pic: AP
Pic: AP
Kellen Winslow, another former NFL player, was convicted of multiple rapes in 2021.
His lawyer argued for his sentence to be reduced because of what he says was head trauma suffered on the football field. That potential mitigating factor was rejected by a judge.
Kellen Winslow. Pic: AP
Winslow at his sentencing hearing in March 2021. Pic: AP
Most experts say it is hard to say definitively what motivates someone to commit a crime, but the symptoms CTE causes could all contribute. More research into the causes of CTE and what factors might make some people more susceptible is under way.
Sky News was given access to the national sports brain bank in Pittsburgh, Pennsylvania where former professional and amateur American footballers are being urged to donate their brains for study.
Inside the histology laboratory, Dr Julia Kofler slices open a brain with a knife to show me the cross-section.
Brains examined by Dr Julia Kofler for CTE
It is impossible to diagnose CTE with the naked eye so she takes a tiny sample of the brain tissue and loads it onto a slide so it can be analysed under the microscope.
I ask if she thinks there is a link between CTE and violent crime. “It’s really difficult to draw any conclusions about what motivates someone to commit a crime based just on their pathology,” she says, “but we certainly know that neurodegenerative diseases can cause all sorts of different behavioural changes and changes in executive function and judgement, so it certainly could have contributed.”
Dr Julia Kofler
‘We watched him lose himself’
Karen Kinzle Zegel is one of those fighting for more research. Her son, Patrick Risha, had CTE and died by suicide aged 32. He had played American football throughout his childhood and at university.
“We watched him over 10 years, sadly lose himself, lose his dignity,” she says, “He was paranoid, he was argumentative.
“One time there was an incident with him and he said a homeless guy attacked him in Pittsburgh and he broke his hand punching this person. The rage he had was definitely scary.”
Photos of Patrick Risha
Patrick Risha had CTE and died aged 32 after taking his own life
Through her organisation Stop CTE, Karen is campaigning for the brains of those who commit mass violence to be analysed for traumatic injury.
“Every time we’re looking at the symptoms like ‘they lost a job, they, broke up with their girlfriend’.
“Everybody wants to know why, why would someone take another person’s life? But if you’ve dealt with somebody whose brain became unwired you see the lack of empathy. They don’t care about other people, sadly.
“We’re not going back to the root cause, which could be a damaged brain.”
Patrick Risha’s mother, Karen Kinzle Zegel
Concerns about brain injuries have contributed to the growth of flag football, a lesser contact sport which means fewer big hits and not an obvious danger.
But the popularity of the NFL as a spectator sport is enduring. Last week’s Super Bowl final was the most-watched TV event in American history.
But for its stars, the damage may already been done. The human cost of the richest sport league in the world is far too difficult to count.
Sky News contacted the NFL for comment about our report. In response, the NFL provided details of the funding they are giving into CTE-related research, mental health support and the physical safety measures they say they are taking in the sport.
Iran says “indirect talks” over the country’s rapidly advancing nuclear programme have taken place with US officials, with more to come next week.
The discussions on Saturday took place in Muscat, Oman, with the host nation’s officials mediating between representatives of Iran and the US, who were seated in separate rooms, according to Esmail Baghaei, a spokesperson for Iran’s foreign ministry.
After the talks concluded, Oman and Iranian officials reported that Iran and the US had had agreed to hold more negotiations next week.
Oman’s foreign minister Sayyid Badr Albusaidi tweeted after the meeting, thanking Iran’s foreign minister Abbas Araghchi and US Middle East envoy Steve Witkoff for joining the negotiations aimed at “global peace, security and stability”.
“We will continue to work together and put further efforts to assist in arriving at this goal,” he added.
(L-R) Iranian foreign minister Abbas Araghchi meets his Omani counterpart Sayyid Badr Albusaidi. Pic: Iranian foreign ministry/AP
Iranian state media claimed the US and Iranian officials “briefly spoke in the presence of the Omani foreign minister” at the end of the talks – a claim Mr Araghchi echoed in a statement on Telegram.
He added the talks took place in a “constructive atmosphere based on mutual respect” and that they would continue next week.
American officials did not immediately acknowledge the reports from Iran.
Mr Araghchi said before the meeting on Saturday there was a “chance for initial understanding on further negotiations if the other party [US] enters the talks with an equal stance”.
He told Iran’s state TV: “Our intention is to reach a fair and honourable agreement – from an equal footing.
“And if the other side has also entered from the same position, God willing, there will be a chance for an initial agreement that can lead to a path of negotiations.”
Reuters news agency said an Omani source told it the talks were focused on de-escalating regional tensions, prisoner exchanges and limited agreements to ease sanctions in exchange for controlling Iran’s nuclear programme.
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Trump on Monday: ‘We’re in direct talks with Iran’
President Donald Trump has insisted Tehran cannot get nuclear weapons.
He said on Monday that the talks would be direct, but Tehran officials insisted it would be conducted through an intermediary.
Mr Trump also warned Iran would be in “great danger” if negotiations fail.
“Hopefully those talks will be successful, it would be in Iran’s best interests if they are successful,” he said. “We hope that’s going to happen.”
He added Iran “cannot have a nuclear weapon, and if the talks aren’t successful, I actually think it will be a very bad day for Iran”.
The comments came after Mr Trump’s previous warnings of possible military action against Iran if there is no deal over its nuclear programme.
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Saturday’s meeting marked the first between the countries since Mr Trump’s second term in the White House began.
During his first term, he withdrew the US from a deal between Iran and world powers designed to curb Iran’s nuclear work in exchange for sanctions relief.
He also reimposed US sanctions.
Iran has since far surpassed that deal’s limits on uranium enrichment.
Tehran insists its nuclear programme is wholly for civilian energy purposes but Western powers accuse it of having a clandestine agenda.
Mr Witkoff came from talks with Russian president Vladimir Putin on Friday, as the US tries to broker an end to the war in Ukraine.
Palestinian student activist Mahmoud Khalil can be deported from the US, an immigration judge has ruled.
Mr Khalil, a postgraduate student at Columbia University’s school of international and public affairs, has been a prominent figure in the university’s pro-Palestinian student protest movement.
The 30-year-old has held a US permanent residency green card since 2024 and his wife is a US citizen.
Mahmoud Khalil. Pic: AP
Mr Khalil was detained at his Columbia apartment building in Manhattan on 8 March, as agents from the Department of Homeland Security (DHS) told him his student visa had been revoked.
It marked the first arrest in President Donald Trump’s crackdown on students who joined campus protests against the war in Gaza.
Mr Khalil, who acted as a mediator between protesters and university officials during pro-Palestinian demonstrations at New York’s Columbia University last year, is not accused of breaking any laws.
But the Trump administration says noncitizens who participate in demonstrations like he has should be expelled from the country for expressing views that the administration considers to be antisemitic and “pro-Hamas”.
On Friday, immigration judge Jamee E Comans ruled that the government had the right to deport him, saying its belief that his presence posed “potentially serious foreign policy consequences” was enough to satisfy requirements for his deportation.
Mr Khalil, centre, surrounded by reporters outside the Columbia University campus in April last year. Pic: AP
He said the government had “established by clear and convincing evidence that he is removable”.
Mr Khalil’s lawyers have said they plan to fight the ruling via the Board of Immigration Appeals and can also pursue an asylum case on his behalf.
The judge gave them until 23 April to seek a waiver.
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His lawyer Marc van der Hout said after the ruling: “Today, we saw our worst fears play out: Mahmoud was subject to a charade of due process, a flagrant violation of his right to a fair hearing, and a weaponisation of immigration law to suppress dissent.”
Mr Khalil, who was born in a Palestinian refugee camp in Syria and holds Algerian citizenship, remains in the Louisiana immigration detention centre where federal authorities transferred him after his arrest.
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Jewish protesters against war in Gaza chant ‘Bring Mahmoud home now’
His defence team has said it is seeking a preliminary injunction from the federal court in New Jersey, which would release him from custody and could block the Trump administration from arresting and detaining people for supporting Palestinian people in Gaza.
The Trump administration has been cracking down on pro-Palestinian protesters at universities across the country.
After his arrest last month, the president said: “This is the first arrest of many to come. We know there are more students at Columbia and other universities across the country who have engaged in pro-terrorist, anti-Semitic, anti-American activity, and the Trump administration will not tolerate it.”
There have also been protests over the arrest of Mr Khalil, including by a Jewish group against the war in Gaza who stormed Trump Tower in New York last month.
Local police said 98 were arrested on charges including trespassing, obstruction and resisting arrest.
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