Detective Kevin Spellman struck and killed 66-year-old Drana Nikac on Oct. 30, 2009 while driving in the Bronx.
He faces 15 years in prison when he's sentenced on Feb. 15. He recently retired from the NYPD after 22 years on the force.
During the trial, the jury heard testimony that Spellman's blood alcohol level was nearly three times the legal limit.
His lawyer said the manslaughter charge didn't require the jury to find him guilty of DWI.
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