Infamous “Preppy Killer”Robert Chambers — who brutally strangled a teenage girl inside Central Park more than three decades ago — was freed from prison on parole this week in his separate drugs and assault case.

Chambers, 56, walked out of New York’s Shawangunk Correctional Facility on Tuesday after serving 15 years of a 19-year sentence for running a cocaine and heroin operation out of his Manhattan apartment, according to state Department of Correction records.