The stabbing death of Marvin Sefton, 41, has left his family in disbelief and wondering about the circumstances surrounding the first homicide of Regina in 2014.

" [I] can't believe he's not here," Rhonda Werstiuk, Sefton's sister, told CBC News Tuesday. "This isn't happening. It's like I'm in a dream."

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Werstiuk arrived in Regina from Kindersley, Sask., after learning her brother had died following some sort of argument in the early hours of Saturday morning in a home at 1056 Garnet Street. He had been stabbed at a house party, police say.

"Marvin kept to himself," Werstiuk said. "If he didn't know the people really good, he would never intrude on anybody [or] impose himself on anybody. But his heart and door were open to everybody."

According to his family, Sefton is from Hudson Bay, Sask., a community he left in 1993 the same year his father died.

He fell out of touch with his mother, Doreen, who said their most recent contact was in 2011.

"I phoned him about three years ago," she told CBC News. "[I] wished him a happy birthday and that was it. Never heard nothing from him since."

Werstiuk said she remained close to her brother.

"I was all he had," she said. "When he would go home for something it would be to my place. Come home for Christmas, it was to me. I was like the Mum to him."

At the time of his death Sefton was working for a drywall company.

Jessica Pelletier, 28, has been charged with second-degree murder.

With files from Adrian Cheung