Lucas Luke Arduini, a 27-year-old software programmer from Oakland, California, disappeared on January 1, 2014, after attending a New Year’s Eve party in San Francisco. He was last seen between 4:00 and 5:30 p.m. on New Year’s Day near the Bay Bridge, reportedly wearing a purple hooded sweatshirt and red Converse sneakers.

Luke had taken an Uber from the party back to his Oakland apartment earlier that morning, and there is evidence suggesting he made it home, but where he went afterward is unknown. He left behind important personal items including his insulin, which alarmed family and friends and raised concerns about his immediate medical needs. Luke was known for his intellect and distinctive tattoos, including Linux code on his chest and the number 42 on his throat.

Despite searches by friends, family and a private investigator hired by his employer, Yahoo, no concrete leads have emerged and the case remains open. If anyone has information about Luke’s whereabouts, please contact the Oakland Police Department.