Police are investigating whether the savage “mystery” gunman who ambushed and killed a 21-year-old woman at her Queens apartment was her abusive ex-boyfriend from South Carolina.

Dashanna Donovan was found lying face down in a pool of blood around 9:20 p.m. Friday with multiple gunshot wounds to her upper body and head in East Elmhurst, NYPD Chief of Detectives Joseph Kenny said in an update Thursday. 3

Video captured her “hanging out” and sitting in an open courtyard in the back of her building near 96th Street and 31st Avenue, when she suddenly looked up and saw the gunman bolting toward her.

“It seems just from her reaction, she knows who the perpetrator is. The perpetrator has his left arm extended, holding a gun,” Kenny told reporters.

“She tries to run. She tries to run so

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