Investigators from Medicine Hat, Alta. are asking for the public's help in piecing together the last days of Robert Stone's life.

Stone, 34, died at the Sarah Steele Building detox facility last Sunday.

He had checked himself into the drug and alcohol treatment centre early that morning, after a night spent shuttling between Whitehorse General Hospital and the drunk tank.

He was first picked up last Saturday evening by an ambulance at the Petro-Canada station on Fourth Avenue.

Stone was transferred to police custody at the hospital after he became combative with the paramedics, according to an emergency medical services official.

Stone was arrested and put in one of the RCMP detachment's two holding cells used for intoxicated people at 7:50 p.m. Saturday.

But at 2:20 a.m. Sunday, the ambulance was called to pick him up again because he was complaining of chest pain and shortness of breath, according to chief coroner Sharon Hanley.

Back at the hospital, Stone was treated and released, Hanley said.

Shortly after, at a little past 4 a.m., Stone checked himself into the detox centre; staff at the facility found him dead just over six hours later.

On Tuesday, the Yukon RCMP announced they had asked the Medicine Hat Police Service to investigate the death.

Even though Stone did not die in police custody, he did have contact with police in the hours leading up to his death, which is why the Medicine Hat investigators are taking over the file, RCMP spokesman Sgt. Don Rogers said Monday.

"We're not investigating the RCMP, we've investigating the death of Robert Stone,” Medicine Hat's Insp. Glen Motz said Wednesday. "It's very different.”

He said the investigators are asking anyone who saw or came into contact with Stone in the 48 hours before he died to contact them.

"People who knew the man in the days leading up to his death will provide us with valuable information about what he was doing and what kind of condition he was in,” Motz said.

Hanley told the Star earlier this week that the man had cuts and bruises on his face, but an autopsy shows no sign he died of any injuries, she said.

At this point in the investigation, police do not suspect foul play, Motz said, "but we are following up on all the angles,” he added.

The doctor who performed the autopsy was unable to determine the cause of death, Hanley said, and will now move on to toxicology tests and microscopic examination of his blood and tissue to try to figure out how Stone died.

Anyone who saw Stone in the days leading up to his death is asked to call the Whitehorse RCMP detachment and leave a message for investigators.

The Medicine Hat officers will be in Whitehorse until at least the end of the week, Motz said.