A 29-year-old Indian-origin man was killed when he was struck by a car which failed to stop at the scene in Handsworth near Birmingham.
Rajesh Chand was crossing the road at the time of the collision, believed to be a hit and run, in the early hours of Saturday.
West Midlands Police are appealing for witnesses and further information as they arrested a 30-year-old man, who remains in custody on suspicion of causing death by dangerous driving in connection with the incident.
It is important that I also remind the public not to speculate on the cause of the collision. This is a fast paced and complex investigation that we are working very hard to solve, said Detective Sergeant Paul Hughes from the Serious Collision Investigation Unit of West Midlands Police.
He said: I am now in a position to release the details of a specific car we are looking for. I would ask that anyone who has knowledge of a Black Audi A4 S Line Estate car, with the number plate NJ60 UOX, to come forward.
This car is likely to have significant damage to the front nearside headlight and I would urge anyone who knows where it is currently located to contact us immediately. I would also like to appeal directly to the driver of this Audi to do the right thing and contact police.
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Police and emergency services rushed to Soho Road at the junction with Thornhill Road in Handsworth just before 4 am local time on Saturday, where Chand was found with serious head injuries.
Paramedics took charge but he was pronounced dead a short time later.
His family members are being supported by dedicated Family Liaison officers, the local West Midlands Police said.
Chand's family released a picture of him on Sunday and have communicated through the police for their privacy to be respected.