David Allen Standish, 63, of Mill Valley, California, was last seen on December 8, 2015 aboard his houseboat docked in Richardson Bay, where he lived. The last known contact before that was a non-criminal police call on the morning of December 7; his family last spoke with him in November 2015 and requested a welfare check when they could not reach him.

Officers visited the houseboat on January 2 and 3, 2016 and found it empty with no signs of a struggle. Standish’s wallet and journal remained aboard, but his Zodiac dinghy used to travel to shore was missing. Investigators have suggested he may have fallen into the bay, but the exact circumstances are unclear and the case remains open.

If anyone saw David, his dinghy, or activity around Richardson Bay in December 2015, please share what is known.