Murder suspect Angus David Mitchell had formed a list of targets that included six people and six businesses when he was gunned down by police last week in Maple Ridge, according to the Integrated Homicide Investigation Team.

Insp. Kevin Hackett said Tuesday that Mitchell's ex-landlord, who narrowly survived being shot outside his home last week, was on the list, as was single mother Chinh Diem Huynh, who was murdered at the Royal Oak Sushi House in Burnaby two days earlier.

"Mitchell appears to have spent time gathering information about his intended victims and planning his entry and escape from the locations where he expected to find them," Hacket said in a statement.

"Investigators are continuing to search for a motive but we are not confident we will find one that would make any sense. Of one thing we are certain: had he not been located when he was, the potential for additional loss of life was extreme."

The remaining names and locations on the list were not released, but Hackett said restaurant owner Andy Tran, who was killed alongside Huynh, was not a target.

Mitchell was tracked to a rural area of Maple Ridge during a massive police manhunt on May 30, spurring a shootout with RCMP. The suspect was shot and later pronounced dead at Royal Columbian Hospital; no officers were injured.

Hacket said police found maps and addresses in Mitchell's green Ford Aerostar van detailing targets who had been in conflicts with the suspect dating back as far as 2009.

The inspector thanked the public and media for spreading an urgent warning asking people to be on the lookout for Mitchell's vehicle, and gave special recognition to Maple Ridge resident Susanne Murphy, who reported the van to police.

Murphy told reporters she spotted the van while walking her dog and became "really nervous." She called 911 and was asked to stop pedestrians from approaching the area until police could arrive.

She said that she danced in her car when she heard that Mitchell had been killed.

Investigators have confirmed that a gun Victoria police seized from Mitchell for mental health reasons in February is the same type of firearm used in last week's shootings.

Mitchell successfully applied to have the weapon returned to him, but Sgt. Jennifer Pound said police cannot yet confirm that his gun was the murder weapon used in Burnaby.

The Vancouver Police Department has launched a review of the decision to have Mitchell's gun returned in Victoria, as well as the circumstances surrounding his shooting in Maple Ridge.