Officer Scott Bashioum and the other officer were responding separately to a 911 call from neighbors at around 3:15 a.M. When they were "ambushed upon their arrival" and immediately shot, state police Trooper Melinda Bondarenka said.
The officers had arrived almost simultaneously, though authorities said other details of the initial confrontation weren't immediately clear.
Bashioum, 52, a father of four on the force for seven years, died less than an hour later at Canonsburg Hospital, the Washington County coroner said.
The man and woman found in the home were not identified by police, but officials said the man died of a self-inflicted wound. No cause of death was given for his girlfriend.
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Attorney David Wolf identified the dead couple to The Associated Press as Michael Cwiklinski, 47, of nearby Houston, Pennsylvania, and his girlfriend, Dalia Sabae.
Wolf said he had known the couple since November 2015, when Cwiklinski was charged with simple assault and harassment for swinging a bag of merchandise and hitting Sabae in the eye.
Neighbors said police were called to the couple's duplex frequently, and Canonsburg Police Chief Al Coghill confirmed the gunman was known to authorities, without naming him or providing details.
Sabae obtained a protection-from-abuse order last month, after dropping one she had last year, Wolf said.
"She told me they were having trouble again," said Wolf, who couldn't represent Sabae because he represented Cwiklinski. Wolf said he had encouraged Sabae to get another protection order and said Cwiklinski was there when he ran into the couple at the county courthouse.
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