A student gunned down in a Birmingham street had an argument with another man seconds before he was found slumped on the ground with a gunshot wound.
Dominique Grant was found lying under a car in Uplands Road, Handsworth, on Sunday afternoon.
Police say he was shot at close range in the chest following a row with the other man.
Det Chief Insp Richard Baker said the 20-year-old, from Edgbaston, was found by neighbours who gave first aid at the scene but the victim died later in hospital.
More than 60 detectives are hunting the killer of the former Perry Beeches secondary school pupil who was studying a personal training qualification at college.
They are also checking to see if there is any link between the killing and shots which were fired in All Saints Road, Winson Green, at 7.55pm on Monday. No-one was hurt.
Police said they were keeping an “open mind” over a motive for the killing.
Mr Grant’s Fiat Bravo car, was found parked near the murder scene, but detectives are still trying to determine why he was in Uplands Road.
Mr Baker said: “We think Dominique turned up of his own accord and possibly didn’t anticipate his life was under threat at that time.
“We are looking at the possibility that this may have been opportunist, that an argument may have occurred and developed into something more.”
The gunman was described as black, in his mid 20s and wearing dark clothing.
Bullet fragments and a cartridge case found at the scene have been sent to specialists at the Birmingham National Ballistics Intelligence Service firearm forensics lab for analysis.