A man shot and killed his ex-girlfriend's new boyfriend outside of a Port Jefferson Station restaurant last night before turning the gun on himself, police say.

It happened at around 11:20 p.m. in the parking lot of the L.I. Pour House, located on Route 112 just north of Route 347.

Police say Mount Sinai resident Frank Panebianco and his girlfriend, Jessica Kasten, both 28, were at the restaurant with friends. They were about to leave when they were confronted in the parking lot by Kasten's ex-boyfriend, identified as 37-year-old Michael Skiadas.

An argument ensued, and investigators say Skiadas produced a shotgun from his Jeep. The couple tried to drive away, heading north on Patchogue Road, but police say Skiadas ran after the car and fired two shots.

Panebianco was struck in the torso and was pronounced dead. Kasten was unhurt.

After the shooting, police say Skiadas returned to his Jeep and killed himself with a gunshot to the head.

Neighbors say Panebianco's family is in shock. They say he was the eldest of four brothers and had worked in a bank. He had only recently started dating Kasten.

Neighbors say Kasten was living with Skiadas up until a few months ago at an apartment complex in Nesconset. A neighbor described the former couple as quiet and "generally happy."

Police say Skiadas was a local pub owner, and did not have a criminal record.