A man who believed his mother was poisoning him is suspected of fatally stabbing her inside her Bay Ridge, Brooklyn home on Friday night, according to police sources.

The downstairs neighbor of Inna Deshkovich, 52, heard fighting upstairs around 7:30 p.m. — then saw the woman’s 30-year-old son storm out of the two-family home on 93rd Street off Ridge Boulevard, according to cops and sources.

The neighbor went upstairs and discovered Deshkovich suffering from a stab wound to the neck in her bedroom that was covered in blood splatter, and called 911, the sources said.

She was pronounced dead at the scene.

Another 911 caller, who identified himself as a friend of the Deshkovich’s son, told the dispatcher that the son allegedly stabbed his mother in the neck because he thought she was poisoning him, according to sources.

The suspect was arrested outside his home in nearby Fort Hamilton just after midnight, sources said.

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