A former NYPD detective -- whose BAC was more than three times the legal limit when he plowed into a Bronx grandmother with a cop car -- was convicted of manslaughter yesterday.

Former Detective Kevin Spellman, however, beat the rap on the most serious charges against him (aggravated vehicular homicide and first-degree vehicular manslaughter) in the death of 66-year-old Drane Nikac, who was struck by the tipsy former detective on October 30, 2009, as she was walking near the intersection of West 232nd St. and Kingsbridge Avenue in the Bronx.