A man wanted in the fatal stabbing of a pregnant Brooklyn mom — who worked as a special officer for the city’s Department of Homeless Services — has now been named a “person of interest” in an upstate slaying, sources said Tuesday.

The NYPD had already been searching for Timothy Taylor as a suspect in the killing of Theresa Gregg, a 37-year-old mother-of-two found stabbed to death in her Brooklyn apartment on May 13, sources said.

Taylor, 35, of Brooklyn, is now also wanted by police in Schenectady, New York, in connection to the death of Tishawn Folkes-Taylor, a 44-year-old woman killed early Sunday morning in the city’s Mt. Pleasant neighborhood.

The US Marshals Service is offering a $5,000 reward for information that leads to his arrest, cops said in a Facebook post.

Folkes-Taylor was Taylor’s ex-wife, police sources said, while Gregg was his current wife. It’s not clear if the victims knew each other.

Schenectady cops said in the post that Folkes-Taylor died of trauma, though her exact cause of death was unclear.

Neither the Schenectady Police Department nor the US Marshals Service responded to requests for comment.

Taylor was living at the Bedford-Atlantic Armory men’s shelter when he got together with Gregg, police sources said.

But their relationship — which neighbors described as a fraught, explosive entanglement that often descended into intense arguments — allegedly ended in horror about two weeks ago when Gregg’s 12-year-old twin daughters found their mom unconscious in her Bedford Avenue home.

She’d been stabbed in the neck and torso during what appeared to be a domestic dispute, sources said. Her blood had poured off the mattress and pooled on the bedroom floor.

Gregg — who worked as a supervising special officer with DHS and had been with the agency for about eight years — was buried last Wednesday after a funeral at the Woodward Funeral Home in Brooklyn.

Neighbors lamented her death the day after she was found.

“I was so shocked yesterday,” downstairs neighbor Johanna Hidalgo had told The Post at the time. “Her daughters are so sweet – every morning, they good morning, they’re smiling. So beautiful, so respectful.”