Onion Lake First Nation is on the west side of the province, close to the Alberta border. Chaplin is about midway between Regina and Swift Current. (Google Maps)

At least five people are dead following two separate crashes in Saskatchewan on Thursday night.

And in a third incident, a sixth person was found dead on the side of Highway 2 near Prince Albert early Friday morning, possibly the victim of a hit-and-run.

Chaplin crash

Three of the deaths happened on the Trans-Canada Highway just east of Chaplin.

RCMP said a pickup truck with five people inside left the highway and rolled in the centre median, two kilometres east of Chaplin, around 9:00 p.m. CST Thursday.

Investigators said they believed four of the five people were thrown out, and that the three who died may not have been wearing seatbelts.

A 29-year-old Estevan man,  a 36-year-old man from Westlock, Alta., and a 19-year-old woman from Estevan were pronounced dead at the scene.

A 17-year-old boy from Texas and a 21-year-old woman from Herbert were taken to hospital with serious injuries.

Grid road rollover

The second fatal crash happened on Onion Lake First Nation at around 10:40 p.m. Thursday. Police said a man, 26, and a woman, 19, were killed when a pickup truck rolled over on a grid road.

Both victims were from Onion Lake, RCMP said.

A woman from the vehicle was also taken to hospital with undisclosed injuries.

Speed and alcohol appear to have been factors in that crash, the RCMP said.

Prince Albert incident

RCMP in Prince Albert asked for the public's help after the discovery of an apparent hit-and-run victim around 2 a.m. Friday.

The 51-year-old man's body was found in a ditch two kilometres south of Prince Albert.

Another driver found the body after running over a shoe on Highway 2. They turned around and called police when they spotted the man's body in the ditch between the two traffic lanes.

"My experience with previous incidents such as this one suggests some noticeable damage to the front end, possibly the bumper, hood portion, possibly the windshield," said RCMP corporal Mike Poirier, in asking the public to keep an eye open for the vehicle involved.

Police believe the man was hit sometime between 1 and 2 a.m. 

 Anyone with information is asked to contact police.