Police in London, Ont., say 23-year-old Muhab Sultanaly Sultan of Calgary is wanted for second-degree murder in last weekend's slaying of Jeremy Cook.
Cook left his phone in a taxi but used an app to track the device to an address in London's north end.
Police have said when he and a relative arrived at the location early Sunday morning the app indicated the phone was in a nearby car with three men inside.
Details of what happened next are sketchy, but police say when Cook tried to get his phone, the vehicle started driving away, prompting the 18-year-old to grab on.
Shots were then fired and Cook died of multiple wounds.
Police say they're investigating a second suspect and issued a statement Friday night making an appeal to the third occupant who they say exited the vehicle immediately prior to the incident.
They're asking him to contact them and identify himself.
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