A New York City police officer has killed himself after reading on Facebook that his girlfriend planned to leave him.

Philip Chlanda fatally shot himself in his car in front of his lover using a 9mm pistol after an argument in his parents' house escalated. The 29-year-old had discovered that his girlfriend was chatting to a Facebook friend over plans to break up with him, something she confirmed during the row.

The woman placed a call to 911 early on Tuesday morning, and he was Chlanda was pronounced dead at Bellevue Hospital where he had been rushed by ambulance.

It is believed that Chlanda was a nationally-ranked long rifle expert.

Pic by Flickr / puamelia