A Westchester county man serving probation for a gun charge was arrested for beating his 32-year-old ex-girlfriend to death in a fit of violence that lasted hours and only ended when he fled with the couple’s 2-year-old son, authorities said Wednesday.

Justin Bartley, 32, was arrested just hours after he allegedly left Roseberline Philippe dead inside a Days Inn motel in Elmsford, according to a lohud.com report .

Philippe met her child’s father at room 230 in the motel on Valley Road off the Saw Mill River Parkway around 8:30 a.m. Sunday following a confrontation a day prior at the victim’s West Chester home, where she lived with her parents, according to lohud.com.

It wasn’t until 4:30 p.m. that day that footage shows Bartley fleeing the motel with his son, court documents show. Cle

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