Major Crash Officers are investigating the death of a young man injured on Saturday night outside Kingsway Bar and Bistro in Darch.
St John Ambulance received an emergency call at 9.35pm and paramedics took the man, injured in a "fall", to Royal Perth Hospital, a spokeswoman said.
But he died as a result of his injuries.
Police need to speak to anyone that saw "a number of youths" at the bar, or the nearby shopping centre at 211 Kingsway, Darch between 9pm and 10pm last night.
Anyone with information - or dashcam vision of the area during this time - should call Crime Stoppers on 1800 333 000.
Major Crash investigators are looking into the death of a man, injured outside the Kingsway Bar and Bistro last night @9NewsPerth pic.twitter.com/fvzeXHuUiV
— Michael Genovese (@GenoveseMichael) January 29, 2017