Mohamed Ibrahim Sail has been charged with second-degree murder, but police do not know where he is, and are warning the public that he is dangerous.
Cook was visiting London, Ont., when he left his iPhone in a taxi. He used the application Find My Phone to track down his device. The app directed him to a parking lot where he had a confrontation with men in a car.
His body was found at the rear of a strip mall near Huron Street and Highbury Avenue in the city's north end. He died from multiple gunshot wounds.
Sail is the second man sought in the slaying. On July 19, Ottawa police were in pursuit of another suspect — Muhab Sultanaly Sultan, 23 — when he went into the Rideau River and drowned. The SIU is investigating his death.
The Special Investigation Unit is a civilian agency responsible for investigating circumstances involving police and civilians that have resulted in a death, serious injury, or allegations of sexual assault.
A third man was seen leaving the parking lot before Cook was shot. London police said they have identified that person, but he has not been co-operative.