Authorities said they will be issuing a Canada-wide warrant for a St. Catharines man in connection with a first-degree murder and an attempted murder on Friday.
About 10 minutes before the stabbing, emergency crews were called to an apartment at 173 Queenston St., where Kuijer's stepson, Nathan Dumas, was found critically injured.
The cause of Nathans death has not been released.
Shortly after Nathan was found, NRP said Kuijer walked into the RBC branch on Martindale Road and assaulted an unidentified female bank employee.
On Sunday, Niagara Regional Police Service spokesperson Philip Gavin said authorities would be seeking a nationwide warrant for Kuijer on Monday. Mr. Gavin says he was not known to the police before this case.
Friends of the boy's family started a GoFundMe campaign to help pay for funeral costs.
Her son's death has been a blow to their community, in the heart of Ontario's wine country, Gavin added. "We obviously know he has access to a vehicle".
"We haven't discussed what happened or why it happened, we can just say they knew each other professionally". The boy died Saturday morning in St. Catharines hospital.
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"He had two different eye colours, so I had to explain to Nathan why that was". But we cant do that because of the measures they took to try and save his life..
Kuijer was last seen fleeing the scene in a dark grey 2009 Pontiac Montana van with the Ontario licence plate number BYTE392. Her name and the hospital she is at are not being released as a security precaution while Kuijer remains at large, Gavin said.
Police say Kuijer is armed and risky and are urging the public to contact them if they have any information on his whereabouts.
Kuijer is said to be armed and unsafe.
The van featured a prominent pink floral decal on the back window referencing missing person Ashley Simpson and "Missing Women of Canada", but Gavin speculated that the sticker might have been removed.
He urged Kuijer to turn himself in peacefully. They said if members of the public see him, they should not approach him and call 911 immediately.
The suspect is described as a white man, about 35 years old, with a thin build, trimmed beard and longer dark hair.
When he was last seen, police said Kuijer was wearing an orange hoodie under a brown leather coat, dark trousers, a black toque, and boots.