43-year-old Lance Perkins disappears after walking out of a San Diego hospital in 2016.  Since then, there have been few updates. 

Sources:

https://www.nbcnews.com/feature/missing-in-america/family-friends-hold-out-hope-search-continues-lance-perkins-san-n7297261

https://www.ocregister.com/2016/12/22/possible-sightings-of-anaheim-man-missing-since-october-prompt-renewed-efforts-to-find-him/