Sergei Turin was 31 when he was last seen in Berkeley, California, on December 26, 2012. Originally from Russia and a former student at the University of California, Berkeley, he was described as 5 feet 9 inches tall, about 120 pounds, with brown hair and brown eyes and no known distinguishing marks.

Circumstances around his disappearance are unclear and few concrete details have emerged. Some reports have speculated about the possibility of suicide, but no conclusive evidence supports any theory. His case is listed in multiple missing person databases, including NamUs, and age-progressed images and updates have been released without producing significant developments.

Anyone who saw Sergei in late December 2012 or who has information about his whereabouts is asked to contact the Berkeley Police Department.