Myles Sanderson, the second suspect in the recent stabbing rampage in Canada, died after being arrested by law enforcement officials on Wednesday. Police searched for him for nearly three days.

The Royal Canadian Mounted Police (RCMP) said that 32-year-old Myles Sanderson was spotted on a highway near the town of Rosthern in the province of Saskatchewan. Officers responded to a report of a stolen vehicle being driven by a man armed with a knife.

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Officers forced Sanderson’s vehicle off the road and into a ditch, Assistant Commissioner Rhonda Blackmore, authorities said, adding that he was detained and a knife was found inside the vehicle. One official said he died of self-inflicted injuries, according to news agency Associated Press.

Rhonda Blackmore of the RCMP said Sanderson went into medical distress after he was arrested. She said CPR was attempted on him before an ambulance arrived. She said emergency medical personnel then took him to a hospital, where he was pronounced dead.

Video and photos from the scene showed a white SUV off to the side of the road with police cars all around. Airbags had deployed in the SUV. Some photos and video taken from a distance appeared to show Sanderson being frisked.

His death came two days after the body of his brother, 30-year-old Damien Sanderson, was found in a field near the scene of their rampage, which also wounded 18 people. Police are investigating whether Myles Sanderson killed his brother.

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The stabbing rampage raised questions about why Myles Sanderson — an ex-con with 59 convictions and a long history of shocking violence — was out on the streets in the first place.

Canadian Public Safety Minister Marco Mendicino said there will be an investigation into the parole board’s assessment of Sanderson, Associated Press reported.