A 21-year-old man slashed the neck of a 17-year-old girl and posted photos of her body on social media before attempting suicide, police in Utica, New York, said Monday afternoon.

Police located Brandon Clark of Bridgeport, New York, near a car in Utica early Sunday morning. They were responding to 911 reports that Clark had posted suicidal messages on social media, Utica Police Department spokesman Mike Curley told HuffPost.

Clark had also called 911 and made incriminating statements regarding homicide, police said in a statement.

As police approached Clark, he slashed his own neck with a large knife, Curley said. Officers provided first aid to Clark and he was transported to St. Elizabeth Medical Center, where he underwent surgery.

He is listed in critical but stable condition and is expected to live, Curley said. Clark was charged with second-degree murder on Monday evening and is currently in the custody of Oneida County Jail, law enforcement officials told HuffPost.

Officers found Bianca Devins body under a tarp outside the car, according to police. Clark apparently killed her with the same knife he later used on himself, Curley said.

Police say Devins and Clark got into an argument while attending a concert in New York City on Saturday night. Curley declined to comment on a possible motive, and would not say whether Clark said anything as officers approached his vehicle Sunday morning.