GPS and video evidence shows that on the morning of Nov. 13, Const. Adrian Oliver was "attempting to locate a recently stolen pick-up truck," Surrey Chief Supt. Bill Fordy said in a release Friday.
"During the course of those efforts, in the moments prior to the collision, he was operating his police vehicle in excess of the posted speed limit, without his emergency equipment activated," Fordy said.
Fordy did not specify how fast Oliver was going when he collided with a semi-trailer at 64th Avenue and 148th Street at about 5 a.m. PT.
Oliver, 28, died at the scene. The truck driver was not injured.
A regimental funeral was held for Oliver on Nov. 20 in Langley, B.C., attended by RCMP Commissioner Bob Paulson and more than 4,000 fellow Mounties and officers from other forces.
Oliver's father is a Mountie, as is his twin brother, Ben.
Fordy said no more information would be released at this time, as the crash investigation is continuing under the supervision of the Vancouver Police Department.
Fordy, the top Mountie in Surrey, said he was making the preliminary information available "to provide the public with an update on the investigation."