Niagara police Const. Phil Gavin says a Canada-wide warrant will be issued later Monday for 43-year-old Justin Kuijer.
Police said Nathan Dumas was found critically injured in a home in St. Catharines, Ont., Friday morning. Police would not release the condition of the child and said they had not confirmed the relationship of the child to the investigation Friday.
Gavin says Kuijer will be sought for a charge of first-degree murder and attempted murder after an alleged stabbing at a local RBC branch.
She called 911. About 10-minutes later Niagara Regional Police responded to calls of a stabbing at the RBC at 211 Martindale Rd.
Friends of Nathan Dumas's family started a GoFundMe campaign that netted $12,000 by Monday morning, $2,000 more than its original target.
"A situation like this, it impacts the community, it impacts the family", he said. He then fled. Police said the incident was not a robbery.
"We believe her injuries to be serious in nature at this point", Gavin said on scene at the Huntington Square strip mall. His whereabouts remained unknown Friday evening.
"He had two different eye colours, so I had to explain to Nathan why that was".
The boy died at St. Catharines hospital Saturday morning. "It's not easy, but we have a job to do, and we try to persevere through that".
He was last believed to be driving a dark grey van with Ontario licence plate number BYTE392. Police said the victim was known to her assailant but police are still trying to determine the motive for the attack. In a Facebook post Saturday, Dumas said funeral arrangements for her son are being covered Victims Services Niagara. Her name and the hospital she is at are not being released as a security precaution while Kuijer remains at large, Gavin said.
Police now report the man is wanted for murder in the death of his stepson. On the rear driver's back window was a pink floral tribute sticker in relation to missing person "Ashley Simpson".
Kuijer remains at large and police say he's armed and unsafe.
He urged Kuijer to turn himself in peacefully.
Police previously said Kuijer was last seen wearing an orange hoodie under a brown leather coat, dark trousers, a black toque, and boots.
The suspect is described as a white man, about 35 years old, with a thin build, trimmed beard and longer dark hair. He was last seen wearing a black tuque, brown leather coat, dark trousers, boots and an orange hoodie.