The second suspect in the stabbing rampage that killed 10 people and injured 18 others in Saskatchewan, Canada, has died in hospital after suffering unspecified "medical distress", police say.
Myles Sanderson, who was in his early 30s, was arrested on Wednesday near the town of Rosthern, around 100 kilometres south-west of where the stabbings took place, the Royal Canadian Mounted Police (RCMP) said.
Saskatchewan RCMP Assistant Commissioner Rhonda Blackmore told reporters that he "went into medical distress" shortly after being apprehended.
She said CPR was attempted on him before an ambulance arrived and took him to hospital, where he was pronounced dead.
The arrest came on the fourth day of an intense manhunt after authorities accused Sanderson and his brother Damien of the stabbings on Sunday.
Damien Sanderson, also in his early 30s, was found dead on Monday at James Smith Cree Nation, one of the stabbing sites.
The assistant commissioner declined to answer questions on whether Myles might have consumed a drug or other substance, saying the manner and cause of his death would be determined by an autopsy.
"All life-saving measures that we are capable of were taken at that time," the assistant commissioner said.
"I can't speak to the specific manner of death," she added.
The assistant commissioner said an emergency caller who reported spotting Myles Sanderson before his arrest said he appeared to have a visible injury.
Video and photos from the scene showed a white SUV off to the side of the road, with police cars all around. The airbags in the vehicle had deployed.
Police had earlier issued an alert warning of a man with knife driving a stolen White Chevy Suburban.
Police said some of the stabbing victims appeared to have been targeted while others were chosen randomly.
They are also investigating if Myles Sanderson killed his older brother.
Investigators have not given a motive for the bloodshed, which is one of the worst acts of mass violence in Canada's history.
Questions about release from prison
The stabbing rampage had raised questions of why Myles Sanderson — a former convict with 59 convictions and a long history of violence — was out on the streets in the first place.
Court documents said Sanderson attacked his in-laws Earl Burns and Joyce Burns in 2015, knifing Earl Jones repeatedly and wounding Joyce Burns. He later pleaded guilty to assault and threatening Earl Burns' life.
In 2017, he barged into his ex-girlfriend's home, punched a hole in the door of a bathroom while his two children were hiding in a bathtub and threw a cement block at a vehicle parked outside, according to parole documents.
He got into a fight a few days later at a store, threatening to kill an employee and burn down his parents' home, documents said.
That November, he threatened an accomplice into robbing a fast-food restaurant by clubbing him with a gun and stomping on his head. He then stood watch during the hold-up.
In 2018, he stabbed two men with a fork while drinking and beat someone unconscious.
He was released by a parole board in February while serving a sentence of more than four years for assault and robbery.
However, he had been wanted by police since May, apparently for violating the terms of his release, although the details were not immediately clear.
When he was released in February, the parole board set conditions on his contact with his partner and children and also said he should not enter into relationships with women without written permission from his parole officer.
In granting Sanderson "statutory release", parole authorities said: "It is the Board's opinion that you will not present an undue risk to society."
Canadian Public Safety Minister Marco Mendicino said there would be an investigation into the parole board's assessment of Sanderson.
"I want to know the reasons behind the decision [to release him]," Mr Mendicino said.
"I'm extremely concerned with what occurred here. A community has been left reeling."
Canadian law grants prisoners statutory release after they serve two-thirds of their sentence. But the parole board can impose conditions on that freedom, and inmates who violate them can be ordered back to prison.
'What I saw that day I can't get out of my head'
The Saskatchewan Coroner's Service said nine of those killed were from the James Smith Cree Nation: Thomas Burns, 23; Carol Burns, 46; Gregory Burns, 28; Lydia Gloria Burns, 61; Bonnie Burns, 48; Earl Burns, 66; Lana Head, 49; Christian Head, 54; and Robert Sanderson, 49. One was from Weldon, 78-year-old Wesley Patterson.
Authorities would not say how the victims might be related.
Mark Arcand said his half sister, Bonnie, and her son, Gregory, were killed.
"Her son was lying there already deceased. My sister went out and tried to help her son, and she was stabbed two times, and she died right beside him," he said.
"Right outside of her home she was killed by senseless acts. She was protecting her son. She was protecting three little boys. This is why she is a hero."
Mr Arcand rushed to the reserve the morning of the rampage but has remained unsettled since then.
"I woke up in the middle of the night just screaming and yelling. What I saw that day I can't get out of my head."
As for what set off the violence, Mr Arcand said: "We're all looking for those same answers."
"We don't know what happened. Maybe we'll never know. That's the hardest part of this."
Many of Sanderson's crimes were committed when he was intoxicated, according to court records.
He told parole officials that, at one point, substance use made him out of his mind.
Records showed he repeatedly violated court orders barring him from drinking or using drugs.
Myles Sanderson's childhood was marked by violence, neglect and substance abuse, court records showed.
Sanderson — who is Indigenous and was raised on the Cree reserve, which has a population of 1,900 — started drinking and smoking marijuana at around 12 years of age, and cocaine followed soon after.
Canada's Indigenous communities are currently plagued by drug and alcohol abuse.
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