An OPP officer was buried Friday in London, Ont. following a fatal collision Monday with an asphalt truck in Elgin County.

Const. Alan Hack was just 31. His service took place at St. Peter's Basilica, but the internment was a private family affair, OPP Const. Dennis Harwood told ctvtoronto.ca.

About 2,000 people attended, with about three-quarters of the crowd consisting of police officers from around the province and across Canada, he said.

Hack was unmarried, but he was engaged to marry Donna McKillop, with their wedding scheduled for August, Harwood said.

His family asked that donations be made to MADD Canada in lieu of flowers.

Hack and Const. Lynne Neale were in an OPP cruiser when it collided with an asphalt truck near Rodney, a village south of Highway 401 and roughly half-way between Chatham and London.

Both officers were taken to hospital in Newbury, but Hack succumbed to his injuries. Neale was taken to a hospital in London for treatment of non-life-threatening injuries.

The officers had stopped a vehicle on the day of their accident. One of the occupants of that vehicle had fled on foot.

Harwood said the officers were looking for that suspect when the collision occurred.

William Nunes, 20, appeared in court on Thursday charged with fleeing police, drug possession, driving without a license, driving with open alcohol in the vehicle and speeding.

Ontario's Special Investigations Union (SIU), which investigates cases of serious injuries or death involving police, is looking into this case.