William Gu was 22 when he was last seen on March 7, 2013. A student at the City University of New York, he split time between an apartment in Brooklyn and his girlfriend’s home in Perth Amboy, New Jersey. Accounts differ on his final movements: some reports say a classmate last saw him on the College of Staten Island campus, while others place him in Brooklyn with plans to meet a friend in Staten Island that never happened.

That evening Gu had borrowed a 1998 silver Lexus belonging to his girlfriend’s roommate. Around 7:30 p.m. the car was found abandoned in Somerset, New Jersey, after apparently crashing into a signpost in front of the Somerset Diner on Easton Avenue. The vehicle was unoccupied and Gu’s keys and cell phone were inside; it is unknown whether he was driving when the car was left.

Gu was described as 5 feet 11 inches and 145 to 160 pounds, with dark brown hair, brown eyes and a distinctive scar on one thigh from an earlier motor vehicle accident. He had sustained a traumatic head injury years earlier that led to depression, paranoia and minor hallucinations, and friends worried he might avoid help. The NYPD and the Perth Amboy Police Department have conducted searches but have not located him.

If anyone knew William’s routines, where he spent time in March 2013, or saw the Lexus near Somerset that night, please share what you remember.