A man beheaded a woman in Farmingdale before jumping in front of a moving Long Island Rail Road train in an apparent murder-suicide last night, investigators said.

Authorities said the decapitated body of a woman in her 60s was found outside an apartment complex on Secatogue Avenue at about 8 p.m. Less than a half-hour later, the MTA reported that a man in his 30s had been struck by an eastbound train on the Ronkonkoma line near the Clinton Street crossing.

UPDATE: Nassau County medical examiners have identified the body as Patricia Ward, 66, an employee of Farmingdale State College. According to Det. Lt. John Azzata with the Nassau County Police Department Homicide Squad, Ward was removed from her apartment at 130 Secatogue Ave. and pulled into the middle of the street, where she was later found by police. The body of her son, Derek, 35, was found a quarter-mile from Clinton St., east of Merritts Rd.

According to police officials, Derek was previously arrested on criminal mischief charges in 2003 and again in 2006, when he was found in the possession of a .9 mm handgun and 100 Valium pills. Police also stated that a knife was recovered from the scene, but cannot definitively identify whether it was used in the murder, at this time.

—Additional Reporting By Daniel Offner