Shawn Cohen

A Nanuet woman faces six months behind bars after pleading guilty Friday to vehicular manslaughter in the drunken crash that killed a well-known lawyer posting campaign signs in Ossining.

Michelle Sergio, 39, could have received up to seven years in state prison, but under the plea agreement will receive shock probation — six months in jail followed by four and a half years of probation, the Westchester County District's Attorney's Office said.

The Sept. 3 crash killed 55-year-old John Mangialardi of Briarcliff Manor, a Republican candidate for Ossining town justice who was posting signs around 10:15 p.m. on Route 9A.

Sergio had been drinking sake that night at a restaurant, her mother has told The Journal News, and was driving her Nissan Altima to work at a center for at-risk children. She was heading north when she struck Mangialardi crossing the street. Afterward, she failed field sobriety tests and registered a 0.12 blood-alcohol level. The drunken-driving threshold is 0.08 percent.

She pleaded guilty in Westchester County Court to two counts of second-degree vehicular manslaughter, a felony, and two counts of driving while intoxicated, a misdemeanor.

She will be sentenced Aug. 11.