Bodycam footage of the altercation is expected to be released later on Friday evening.
His family said the “very horrific” video showed officers savagely beating the FedEx worker for three minutes in an assault their lawyers likened to the Los Angeles police attack on motorist Rodney King in 1991.
Five sacked officers, who are all black, have been charged with second-degree murder and other crimes, including assault, kidnapping, official misconduct and official oppression, over Mr Nichols’s death.
Civil rights lawyer Ben Crump, who is representing his family, said when the public watches the footage they will see him calling out for his mother.
He said: “When you all see this video, you’re going to see Tyre Nichols calling out for his mum.
“He calls out three times for his mother. His last words on this earth are, ‘mum, mum, mum’. He’s screaming for her. When you think about that kidnapping charge, he said ‘I just want to go home’.”
“It’s a traffic stop for God’s sake. A simple traffic stop.”
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Mr Nichols’s mother, RowVaughn Wells, told reporters: “For a mother to know their child was calling them in their need and I wasn’t there for him. Do you know how I feel right now? Because I wasn’t there for my son.”
Ms Wells recalled she had “a really bad pain in my stomach” and once she found out what happened she realised “that was my son’s pain that I was feeling”.
“For me to find out my son was calling my name, you have no clue how I feel right now,” she added, struggling to hold back tears.
She also said she had not yet seen the video but urged anyone with children not to let them watch it.
“I have never seen the video but what I have heard is very horrific.”
She added the charged officers had “disgraced their families”.
“I want to say to the five police officers who murdered my son, you also disgraced your own families when you did this.
“But I am going to pray for you and your families. Because this shouldn’t have happened. We want justice for my son.”
She has pleaded for peaceful protests.
Police pulled Mr Nichols over for alleged reckless driving before there was an “altercation” where officers used pepper spray on him, according to Shelby County district attorney Steve Mulroy.
Mr Nichols then tried to flee on foot and another altercation followed, he added.
His family say the officers beat him and the injuries he sustained during the encounter led to his death.
Relatives accuse police of causing him to have a heart attack and kidney failure. Authorities have only said he experienced a medical emergency.
The officers were assigned to the ‘scorpion’ unit which focuses on violent street crime. The family’s lawyers want it to be disbanded.
Memphis police chief Cerelyn Davis has said the department will review scorpion and other specialised units.
President Joe Biden said the Nichols family and the city of Memphis deserve “a swift, full and transparent investigation”.
“Public trust is the foundation of public safety, and there are still too many places in America today where the bonds of trust are frayed or broken,” he added.
Emergency responders are searching for bodies inside stranded cars and buildings following deadly flash floods in Spain that have killed at least 158 people.
Scenes of destruction have been left in the wake of the powerful floodwaters which hit the east of the country late on Tuesday and early Wednesday, marking Spain‘s worst natural disaster this century.
Cars have been piled high on top of each other, homes and businesses have been swept away, trees have been uprooted, and roads and bridges have been left unrecognisable.
At least 92 people have died in the worst-hit region of Valencia, while deaths were also reported in Castilla La Mancha and southern Andalusia.
An unknown number of people remain missing.
“Unfortunately, there are dead people inside some vehicles,” Spain’s transport minister Oscar Puente said.
In the Valencian district of La Torre, nine dead bodies were discovered inside a garage – with a local police officer among the victims.
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Man pulled from deadly floods
Luis Sanchez, a welder, said he saved several people from floodwaters rushing through the V-31 motorway south of Valencia city.
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“I saw bodies floating past. I called out but nothing,” Mr Sanchez said.
“The firefighters took the elderly first, when they could get in. I am from nearby so I tried to help and rescue people. People were crying all over, they were trapped.”
Satellite images from NASA show how severe flooding has impacted Valencia and its surrounding towns.
The images, captured on 30 October, show large areas to the south of the city covered in floodwater.
The Turia river, which runs through the city, can be seen at a much higher level.
The Pobles del Sud, a large lake nearby, overflowed. Much of the area surrounding the lake was covered in floodwater.
The worst of the destruction was concentrated in Paiporta, a municipality next to Valencia city, where 62 people have been reported dead.
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Spanish town ‘worst-hit’ by floods
Mayor Maribel Albalat told national broadcaster RTVE: “We found a lot of elderly people in the town centre. There were also a lot of people who came to get their cars out of their garages… it was a real trap.”
What has caused the devastation?
The flooding events in Spain have been hard to witness. But the rainfall there could never have been anything but devastating.
Chiva, located just to the west of Valencia, received 491mm of rain in an eight-hour window.
Some 100-200mm fell in surrounding areas with the accumulation of running water producing apocalyptic scenes.
In addition there have been over 20,000 lightning strikes.
Whilst the rainfall totals are astounding in themselves, this part of the world is simply not accustomed to huge quantities of water falling from the sky.
In an average year, Spain would expect somewhere between 50 and 100 mm of rain throughout the entire month of October but Valencia and Andalusia would expect far less – just 60–70mm.
So how did this happen? It’s attributable to a DANA, a “depresion aislada en niveles altos” or a “cut-off low”.
This is a low pressure system which becomes slow moving or stationary, blocked by high pressure elsewhere, which can only keep shedding its rain over the same area for long periods of time.
These systems are not that unusual. They occur when cool air from the north is drawn across the Mediterranean in late summer and autumn when the waters are war. The temperature differential enhances storms and rainfall totals.
But whilst not uncommon, this one was certainly extreme.
And it hasn’t gone yet. This same system has continued to bring further heavy rain and thunderstorms today, but it has now moved a little further north and east, heading toward the French border and currently remaining to the west of Barcelona.
The rain and thunderstorms are likely to continue for a few days yet with the Tarragona and Castellon regions still under an amber warning while a yellow warning remains in force for both eastern and western Spain.
Spanish Prime Minister Pedro Sanchez said on Thursday morning that Valencia had been declared a disaster zone and that the priority was to find victims and missing people.
He also urged those affected to stay at home as more torrential rain was forecast.
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“The most important thing is that I know Spanish people are aware that this phenomenon has not finished,” he said.
Sky News’ Europe correspondent Adam Parsons, reporting from Valencia, said the devastation suffered in the region is “enormous”.
“What we’re witnessing now are the locals here who are waking up and seeing what’s happened to their town and what has happened is something almost apocalyptic,” he said.
A nearby shop was left “absolutely wrecked” and looked like a “bomb has gone off in there”, he added.
Three days of mourning has been declared in Spain, beginning on Thursday.
Spain’s Mediterranean coast is used to autumn storms that can cause flooding, but this was the most powerful flash flood event in recent memory, and scientists have linked its strength to climate change.
“When the alert came the water was already two metres high,” Carolina shouts from her balcony. “There were no police, firefighters or the mayor. No one came to rescue us.”
The distress is echoed street after street.
Carmen puts her head in her hands and weeps.
“They have lost everything,” she says, pointing at her neighbours’ houses.
Every home is in ruins and their owners are heartbroken.
Dolores shows us inside her house. She says the flood was up to the ceiling but because no help came, they have had to hammer holes in the walls to clear the water.
“I feel awful. I’m terrified and very afraid. My husband is sick – we need more help,” she says.
The level of destruction is immense.
On the street, we meet Noel with his children. The youngest toddler barefoot in the mud.
Yesterday, Noel and his wife had nothing to eat. He feels helpless.
“Right now, there are people who are trapped. The mud is up to their waists, so they can’t open their doors,” he says.
“I live on a high floor so I didn’t have problems with the flooding in my home, but I don’t have water, light, or food.”
There’s a growing feeling of desperation in this suburb.
At one point, someone shouts “food!” and people rush to grab what they can from a nearby shop.
It’s not clear if they have been let in by the owner or are looting.
The devastation is so great and at a time when people are at their most in need, they feel frustrated and alone.
In a nearby shelter we meet people from Algemesi who have been made homeless by the flood.
Carol says she has never felt so hopeless.
“There was a tree trunk that came into the front of my house. There are no walls, no ceiling. I don’t have anything. There’s nothing left,” she explains, beginning to cry.
For many, the initial trauma of this natural disaster has been compounded in the aftermath by a feeling of loss and loneliness.
Thousands of North Korean soldiers are now positioned near Ukraine’s border and likely to enter combat in the coming days, the US says.
Russian troops have been training them in artillery, drones and “basic infantry operations, including trench clearing”, said US secretary of state Antony Blinken.
He said it strongly indicated they would be used on the front line and would therefore become legitimate targets for Ukraine.
Some 10,000 North Korean troops are in Russia, including up to 8,000 in the Kursk border region, Mr Blinken said.
The troops are wearing Russian uniforms and carrying Russian gear, according to US defence secretary Lloyd Austin.
“We’ve not yet seen these troops deploy into combat against Ukrainian forces, but we would expect that to happen in the coming days,” Mr Blinken said on Thursday.
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America’s top diplomat said the recruitment of troops from North Korea to Russia’s “meat grinder” was a “clear sign of weakness”.
Mr Blinken made the assessment after he and Mr Austin met their South Korean counterparts in Washington DC.
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Foreign minister Cho Tae-yul called for the immediate withdrawal of North Korean soldiers from Russia and condemned it “in the strongest possible terms”.
They also all agreed China should do more to rein in North Korea, Mr Blinken said, adding that he’d had a “robust conversation” with Beijing this week.
Mr Austin also announced that – with the US election just days away – America would soon be announcing new security assistance for Ukraine.
The deployment of troops to Russia is down to the close relationship between President Putin and North Korea’s Kim Jong Un.
A mutual defence pact was agreed during their summit, meaning the countries will help each other if they are attacked.
The US says North Korea has also given munitions to Russia as it continues its grinding effort to take more territory in Ukraine’s east.
The White House published images earlier this month which it said showed 1,000 containers of equipment being sent to Russia by rail.
There are concerns about what military aid Russia will now provide in exchange.
North Korea test-fired an an intercontinental ballistic missile for the first time in almost a year on Thursday and there is speculation Russia may have provided technological help.
In a statement, the US, Japan and South Korea condemned the launch as a “flagrant violation” of UN resolutions.
“We strongly urge (North Korea) to immediately cease its series of provocative and destabilising actions that threaten peace and security on the Korean Peninsula and beyond,” they said.