Peter Denis O’Brien, 44, an audio editor for films, was last seen in Boise, Idaho, on April 2, 2009. That evening he dropped his two young sons at his ex-wife’s home and was due to pick them up two days later on April 4 but never returned. He has not been seen or heard from since.

O’Brien left his apartment unlocked and behind nearly all personal effects — wallet, keys, cell phone, credit cards and his car — while his laptop and passport were missing. His April rent had been paid in advance. He had moved to Boise from Los Angeles seven weeks before his disappearance to be closer to his children and was reportedly under personal and financial strain; his relationship with his ex-wife was described as strained but she did not believe he was depressed.

Investigators have explored multiple possibilities: a hiking accident near Camel’s Back Park, suicide (no evidence found to support this), intentional disappearance within the United States, and other leads. There is no record showing his passport was used. His whereabouts remain unknown.

If anyone knew Peter, saw him in Boise in early April 2009, or has information about his laptop or passport, please come forward.