Ottawa police officers who chased a man wanted in a London, Ont., murder investigation won't be charged in his drowning.

The Special Investigations Unit says there is no evidence the officers committed a criminal offence in the death of Muhab Sultan, who drowned in June after jumping in the Ottawa River to evade police.

The SIU says the officers even tried to rescue Sultan and were "tantalizingly close to reaching him before he dipped out of sight below the water's surface."

The agency says the chase began after Sultan struck an officer on bike patrol with his car.

He was wanted in the shooting death of 18-year old Jeremy Cook, who was killed on June 14 after tracking his missing cellphone to a car with three men inside.

A second suspect, 24-year-old Mohamed Ibrahim Sail, surrendered to police last month. Investigators have said a third suspect has been identified but isn't co-operating.