Canadian fugitives Kam McLeod and Bryer Schmegelsky died by suicide

Canadian authorities have revealed the two teen fugitives suspected of killing three people died by suicide.

The bodies of Kam McLeod, 19, and Bryer Schmegelsky, 18, were found in thick bushland in remote Manitoba last Wednesday to end one of the largest manhunts in the country's history.

The pair were suspects in the murders of Australian tourist Lucas Fowler, his American girlfriend Chynna Deese and university professor Leonard Dyck.

The Royal Canadian Mounted Police today said the Manitoba Medical Examiner had completed autopsies on the two men and determined they had taken their own lives.

"While both individuals were deceased for a number of days before they were found, the exact time and date of their deaths are not known," the RCMP said.

"However, there are strong indications that they had been alive for a few days since last seen in July and during the extensive search efforts in the Gillam area."

Two guns were found near the bodies and forensic analysis is underway to confirm whether they were the weapons used in the three murders.

Mr Fowler, 23, and Ms Deese, 24, were found dead by the Alaska Highway near Liard Hot Springs in northern British Columbia on July 15.

Read more: Brother of Chynna Deese reveals anguish

Investigators said it appeared the couple had been shot after their van broke down by the remote road.

Mr Dyck's body was found near a burnt-out Toyota RAV4 four days later around 500km away in Dease Lake.

While McLeod and Schmegelsky were initially considered missing persons, they were soon linked with the murders and deemed wanted suspects.

The manhunt eventually zeroed in on Gillam, a town more than 4000km from the sites of the murders.

The RCMP have said they still do not know why Mr Fowler, Ms Deese and Mr Dyck were killed.

Schmegelsky's father Alan told 60 Minutes the fugitive his son became was not the person he knew.

"He was my only child. (I'll) never get to hug him again, never get to spend time with him again," he said.

"At least I know where he is, his troubles are over, I'm sad that he felt he had to take that road trip."

Readers seeking support and information about suicide prevention can contact Lifeline on 13 11 14.

Suicide Call Back Service 1300 659 467.

MensLine Australia 1300 78 99 78.