The murder of Tim McLean (born 1985) occurred on the evening of July 30, 2008. McLean, a 22-year-old Canadian man, was stabbed and beheaded while riding a Greyhound Canada bus about 18 miles (29 km) west of Portage La Prairie, Manitoba traveling the Trans Canada Highway. On March 5, 2009, McLean's killer, 40-year-old Vince Weiguang Li, was found to be not criminally responsible for the murder.

The incident took place near Portage la Prairie, Manitoba, during a trip from Edmonton to McLean's hometown of Winnipeg. According to witnesses, McLean was sleeping with his headphones on when the man sitting next to him suddenly produced a large knife and began stabbing McLean in the neck and chest. The attacker then decapitated McLean and displayed his severed head to other passengers outside who had fled the bus in horror. The Royal Canadian Mounted Police (RCMP) arrested 40-year-old Vince Weiguang Li soon afterward.

At 12:01 a.m. on July 30, 2008, Tim McLean, a carnival worker, was returning home to Manitoba after working at a fair in Alberta . He departed Edmonton on board Greyhound bus 1170 to Winnipeg, via the Yellowhead Highway through Saskatchewan. He sat at the rear, one row ahead of the washroom. At 6:55 p.m., the bus departed from a stop in Erickson, Manitoba with a new passenger, Vince Weiguang Li. Li, described as a tall man in his 40s, with a shaved head and sunglasses, originally sat near the front of the bus, but moved to sit next to McLean following a scheduled rest stop. McLean "barely acknowledged" Li, then fell asleep against the window pane, headphones covering his ears.