Shortly afterwards, police began a manhunt for Kuijer, 43, of St. Catharines, for attempted murder in connection to the bank stabbing.
"We believe her injuries to be serious in nature at this point", Gavin said on scene at the Huntington Square strip mall.
Gavin said Nathan's death has been a blow to the community in the heart of Ontario's wine country, adding his mother has been trying to come to terms with not only the loss of her son but the scope of Kuijer's alleged actions.
Police have confirmed that Kuijer is the stepfather of the seven-year-old victim and had a professional relationship with the bank employee who was stabbed.
On Sunday, Niagara Regional Police Service spokesperson Philip Gavin said authorities would be seeking a nationwide warrant for Kuijer on Monday.
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The boy's exact cause of death hasn't been released.
Police say Kuijer is considered armed and risky and his whereabouts remain unknown.
Police also secured a building at 173 Queenston Street Friday that is listed in the phone book as the residence of Kuijer.
Dumas said she doesn't understand why anyone would hurt her son other than as a way to hurt her.
Just after 10:15 a.m. on Friday, paramedics and police were called to an address located on Queenston Street after a report of a child in medical distress.
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Kuijer should is being considered armed and risky.
"I said to him, 'Well let's go inside and talk about arrangements for our kids.' We have three kids", Dumas said in an interview with The Standard.
Initially treated at the St. Catharines site of the Niagara Health System, the woman was transported to a trauma centre outside of the Niagara region.
S, Ont. - A 43-year-old man is wanted for first-degree murder in connection with the death of his stepson, who family friends described as a "loving little boy".
Kuijer is said to have left the RBC branch driving a dark grey 2009 Pontiac Montana van, with Ontario license plate BYTE 392.
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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. They advised the public not to approach him if they see him and to call 911 instead. He was last seen wearing a black tuque, brown leather coat, dark trousers, boots and an orange hoodie. A sign on the RBC door said it would reopen Monday.