Officers responding to the Plymouth Garden Apartments on Fayette Street around 11:30 p.m. found a woman with multiple stab wounds and the man, holding what appeared to have been a handgun, Montgomery County DA Kevin Steele said.
The man did not comply to officers' commands and was shot after pointing a handgun at them, Steele said.
Authorities immediately rendered aid to the man, who was rushed to Suburban Community Hospital, where he was pronounced dead around 1:35 a.m., Aug. 4, authorities said.
His identity has not yet been released.
The female victim stabbed was later identified as the man's mother, and she was admitted to a local hospital in stable condition, Steele said.
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