A dashcam video shows the final moments of a 27-year-old man whose dad claims he was "murdered" by British police.
Professor's son Arthur Holscher-Ermert can be seen trying to cross the road before an unmarked police car appears to move and hit him. He flew across the Tarmac and later died of his injuries.
A police constable is now under criminal investigation for the offence of causing death by dangerous driving.
The tragedy unfolded on the A259 in Peacehaven, East Sussex, and left Arthur - son of respected economist Professor Jens Holscher - with devastating injuries.
Arthur's father says police first chased him because he was driving an uninsured vehicle. He was allegedly handcuffed as he lay in the street dying.
Prof Holscher, who lectures at Bournemouth University, today told the Mirror: "It looks like murder to me."
Arthur, from Newhaven, East Sussex, was on foot when he was struck by the vehicle on Saturday.
Prof Holscher said: "It's horrible, we are still in shock. That will not go away very soon, that's for sure."
The grieving father says he has watched dashcam footage two or three times.
He said: "It's very shocking. Apparently he was chased because the car he was driving was not insured. But he left the car, he was not in the car anymore. It's horrible. Why did they not stop? I don't get it.
"It looks like murder to me. I can't think of any reason. Arthur did not do any harm. This should be a civilised society."
He added: "I can't think of any reason except for being absolutely careless with someone's life."
According to The Times, the 27-year-old can be heard groaning while officers restrain him face down after the collision.
Another clip shows officers attempt CPR while witnesses can be heard shouting: "You've killed him."
Prof Holscher also told the Mirror of plans to lay Arthur to rest with his mum Karin Ermert, who sadly died of heart failure in December 2018.
He said: "The funeral ceremony will take place in Brighton, that's where he had all his friends, so we will go there.
"We will have the ashes delivered to the graveyard where his mother lies in Poole. So they can be together. He should be there next to her."
Arthur's father said his son was "full of plans" for his future: "He wanted to become a dog breeder and had got four puppies two weeks ago. His brother is looking after them now.
"Karl (his brother) is crying all the time. I can hardly speak to him. He (Arthur) had a girlfriend, a very very nice lady. Apparently she is also crying all the time."
Prof Holscher claims he is yet to receive an apology: "The officer who notified me was very nice but I think in this case it needs to be a senior officer expressing apologies in person or at least a letter."
The IOPC will carry out an independent investigation and Prof Holscher says he has been told the probe will take six months.
In a press release published on May 5, the IOPC said it had gathered "a substantial amount of evidence" and "the driver of the unmarked police car which Mr Holscher-Ermert was in collision with... is under criminal investigation for the offence of causing death by dangerous driving".
It added: "A criminal investigation does not necessarily mean that charges will follow.
"At the end of the investigation we will decide whether to refer a file to the Crown Prosecution Service to consider whether the officer should be prosecuted.
"The officer, a police constable, will also be investigated for potential gross misconduct."
IOPC regional director Graham Beesley said: “Our thoughts are with Mr Holscher-Ermert’s family, and with everyone else who was involved in this tragic incident and has been affected by his death.
“We have provided his family with an update into the progress of our investigation and we will be meeting with them soon.
“As well as investigating the collision we are also examining the events leading up to it and police actions in the immediate aftermath.
“It is important we establish why Mr Holscher-Ermert was being pursued by the police including what, if any, information the police had about him or the vehicle he was driving.
“We will also consider whether the actions of officers afterwards were in line with policy and procedure.
"This will include looking at the aftercare given to him. We are aware of reports handcuffs were applied to Mr Holscher-Ermert at the scene and this will form part of our investigation.
“We understand the concern this incident has caused in the community and I would like to reassure everyone that we will carry out a thorough and independent investigation to establish exactly what happened and why.”
Arthur's father earlier said he would be taking legal action against Sussex Police.
A peaceful protest march is being organised in Lewes on Saturday by Arthur's brother Karl.
Chief superintendent Jo Banks earlier said: “Our thoughts are with the family and friends of the man who tragically died in this collision.
“We recognise the impact of this incident on his family and the local community and we are fully co-operating with the IOPC to ensure a full and fair investigation.
“The IOPC are liaising with the family and as such we are unable to provide further information.”
The IOPC is still appealing for anyone with information that may assist our investigators to come forward and talk to us.
It would also like to hear from anyone with mobile phone or other footage they may have recorded that may be relevant.
Anyone with information is urged to call 0300 3035612 or email peacehavenrti@policeconduct.gov.uk as soon as possible.
