In a landmark case, his mother Jennifer Crumbley, 45, was found guilty of four counts of manslaughter – one for each victim – in February this year.
After prosecutors argued Ethan’s father also bore responsibility because he and his wife gave their son the gun and ignored signs of violence, James Crumbley, 47, was convicted on Thursday.
The Crumbleys were the first parents to be charged with manslaughter in a child’s school shooting in a country where such incidents are relatively common.
Gun safety experts hope the Crumbley trials serve as a wake-up call for parents to secure weapons in their homes, with 75% of school shooters getting guns from home, according to government research.
“This is a very egregious and rare, rare set of facts,” prosecutor Karen McDonald told the jury on Wednesday.
Ms McDonald said James Crumbley repeatedly ignored warning signs his son was deeply disturbed, did not get him help, and did not do enough to safely store the firearm in the family home.
“He did nothing over and over and over again,” she added.
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Ms McDonald also presented texts Ethan sent to a friend and journal entries in the months before the shooting, in which he talked about wanting medical help and hearing voices, but he was worried his parent would be “pissed”.
On one occasion, according to a text message to a friend, Ms McDonald said Ethan had asked James Crumbley to take him to the doctor, but his dad “gave me some pills and told me to suck it up”.
Defence lawyer Mariell Lehman argued James Crumbley could not have possibly foreseen his son would carry out a mass shooting.
“James had no idea that his son was having a hard time,” Ms Lehman told jurors, saying no evidence had been presented that James knew the contents of his son’s text messages or journal.
‘The thoughts won’t stop – help me’
According to prosecutors, James Crumbley bought the gun used in the attack four days before the shootings.
On the morning of the shootings, on 30 November, a teacher found drawings by Ethan showing a handgun, a bullet and a bleeding figure next to the words “blood everywhere”, “my life is useless”, and “the thoughts won’t stop – help me”.
Summoned to the school that same morning, the Crumbleys were told Ethan needed counselling and they needed to take him home, according to prosecutors.
But the couple wouldn’t take their son, prosecutors said, and did not search his rucksack or ask him about the gun.
Both of the Crumbleys challenged that account in their trials, saying teachers in the meeting mutually agreed Ethan could remain in school that day and at no point did they think he posed a danger.
Ethan was returned to class and later walked out of a bathroom with the gun and began firing, according to prosecutors, killing 14-year-old Hana St Juliana, 16-year-old Tate Myre, 17-year-old Madisyn Baldwin, and 17-year-old Justin Shilling and injuring seven other people.
Jennifer Crumbley is set to be sentenced on 9 April.
It was the first time a US president had been convicted of or charged with a criminal offence.
Trump had tried to cover up “hush money” payments to a porn star in the days before the 2016 election.
When Stormy Daniels‘ claimsof a sexual liaison threatened to upend his presidential campaign, Trump directed his lawyer to pay $130,000 (£102,000) to keep her quiet.
The payment buried the story and he later won the presidency.
Trump denied the charges and said the case was politically motivated. He also denied the sexual encounter took place.
New York State Supreme Court Justice Juan Merchan today delayed the sentencing, which had been due to take place on Tuesday.
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The office of district attorney Alvin Bragg had asked the judge to postpone all proceedings until Trump finishes his four-year presidency, which starts on 20 January.
Trump’s lawyers say the case should be dismissed because it will create “unconstitutional impediments” to his ability to govern.
Responding to Friday’s decision, a Trump campaign spokesman said: “The American People have issued a mandate to return him to office and dispose of all remnants of the Witch Hunt cases.”
The judge set a 2 December deadline for Trump’s lawyers to file their motion, while prosecutors have until 9 December to respond.
He did not set a new date for sentencing or indicate when he would rule on any motion to throw out the case.
Even before Trump’s win in this month’s election, experts said a jail term was unlikely and a fine or probation more probable.
But his resounding victory over Kamala Harris made the prospect of time behind bars or probation even less likely.
Trump, 78, was also charged last year in three other cases.
One involved him keeping classified documents after he left office and the other two centre on alleged efforts to overturn his 2020 election loss.
A Florida judge dismissed the documents case in July, the Georgia election case is in limbo, and the Justice Department is expected to wind down the federal election case as it has a policy of not prosecuting a sitting president.
Trump last week nominated his lawyers in the hush money case, Todd Blanche and Emil Bove, for senior roles in the Justice department.
When he re-enters the White House, Trump will also have the power to shut down the Georgia and New York cases.
Donald Trump has pledged for years to surround himself with ultra-loyalists who can mould his government to his vision without barriers.
That’s precisely why he picked Matt Gaetz. Now he’s out, Pam Bondi is in and she’s equally loyal.
Gaetz was uniquely unpopular on Capitol Hill but ultra-MAGA and ultra-loyal to the president-elect.
He was chosen by the president-elect to do his bidding inside the Justice Department as attorney general.
Critics called his pick “a red alert moment for democracy” and the man a “gonzo agent of chaos” – language that would surely only affirm Trump’s decision in his own proudly disruptive mind.
If it wasn’t for the fact that the president-elect is himself a convicted felon, and a man found liable in a civil court of his own sexual offences, the prospect of Gaetz, with all his baggage, making it through the nomination process would have seemed remote.
But Donald Trump’s return to the White House suggested anything is possible.
And so, beyond his loyalty, Gaetz was Trump’s test for his foot soldiers on Capitol Hill. How loyal were they? Would they wave through anyone he appointed?
It turns out that Gaetz, and the storm around his private life, was too much for a proportion of them.
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At least five Senate Republicans were flatly against Matt Gaetz’s confirmation. We understand that they communicated to other senators and those close to Trump that they were unlikely to be swayed.
They included the Republican old guard like Senator Mitch McConnell.
Beyond the hard “no” senators, there were between 20 and 30 other Republicans who were very uncomfortable about having to vote for Gaetz on the Senate floor.
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2:23
Trump pick Matt Gaetz withdraws
The key question is whether Gaetz was Trump’s intentional wild card crazy choice that he knew, deep down, would probably never fly.
Was Gaetz the candidate he had accepted would be vetoed by senators – who would then feel compelled to wave the rest of his nominees through?
Will Pete Hegseth’s alleged sexual impropriety concern them as they consider the suitability of the former Fox News host and army major to run the Department of Defence?
What about Tulsi Gabbard, the candidate Russian state TV calls ‘our girl’, and the appropriateness of her running America’s intelligence agencies?
These are all appointments that the politicians on Capitol Hill must consider and confirm in the weeks ahead.
We don’t yet know who Trump will choose to direct the FBI.
There are some names being floated which will make the establishment of Washington shudder but then that’s precisely why Trump was elected. He is the disrupter. He said so at every rally, on repeat.
He was quick to pivot to another name to replace Gaetz.
Bondi is the former attorney general of Florida. Professionally she is in a different league to Gaetz. She’s been a tough prosecutor, with a no-nonsense reputation.
She is also among the most loyal of loyalists. Her attachment to Trump stretches way back.
I first came across her in Philadelphia in November 2020 when she was among Trump surrogates claiming the election back then had been stolen from them by Joe Bidenand the Democrats.
She was a key proponent of the false claims the election had been rigged and Trump was the rightful winner.
The court cases concluding that was all nonsense didn’t seem to convince her.
Now she is poised to head up the Department of Justice as the country’s top law enforcement official.
Within hours of taking office, president-elect Donald Trump plans to begin rolling out policies including large-scale deportations, according to his transition team.
Sky News partner network NBC News has spoken with more than half a dozen people familiar with the executive orders that his team plans to enact.
One campaign official said changes are expected at a pace that is “like nothing you’ve seen in history”, to signal a dramatic break from President Joe Biden’s administration.
Mr Trump is preparing on day one to overturn specific policies put in place by Mr Biden. Among the measures, reported by sources close to the transition team, are:
• The speedy and large-scale deportations of illegal immigrants
• Ending travel reimbursement for military members seeking abortion care
• Restricting transgender service members’ access to gender-affirming care
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But much of the first day is likely to focus on stopping illegal immigration – the centrepiece of Trump’s candidacy. He is expected to sign up to five executive orders aimed at dealing with that issue alone after he is sworn in on 20 January.
“There will without question be a lot of movement quickly, likely day one, on the immigration front,” a top Trump ally said.
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“There will be a push to make a huge early show and assert himself to show his campaign promises were not hollow.”
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2:23
Donald Trump ally Matt Gaetz has withdrawn his name from consideration to be the next US attorney general.
But Mr Trump’s campaign pledges also could be difficult to implement.
Deporting people on the scale he wants will be a logistical challenge that could take years. Questions also remain about promised tax cuts.
Meanwhile, his pledge to end the war between Russia and Ukraine in just 24 hours would be near impossible.
Even so, advisers based at Mr Trump’s Mar-a-Lago resort or at nearby offices in West Palm Beach, Florida, are reportedly strategising about ending the wars in Ukraine and the Middle East.
Following his decisive victory on 5 November, the president-elect has moved swiftly to build a cabinet and senior White House team.
As of Thursday, he had selected more than 30 people for senior positions in his administration, compared with just three at a similar point in his 2016 transition.
Stephen Moore, a senior economic adviser in Mr Trump’s campaign, told NBC News: “The thing to realise is Trump is no dummy.
“He knows he’s got two to three years at most to get anything done. And then he becomes a lame duck and we start talking about [the presidential election in] 2028.”