Andy Cohen is appealing for the safe return of his missing school friend.
The 53-year-old radio and television talk show host's childhood friend, Andy Neiman, who has bipolar disorder, has been missing for two weeks.
The actor was last seen at MidHudson Regional Hospital in Poughkeepsie, New York, on May 21.
The 'Watch What Happens Live' host, who recently shared his missing persons poster on Facebook, told E! News: "Andy is younger than me, but we went to the same camp — Nebagamon in Wisconsin — and the same high school.
"I'm praying for his safe return, along with a lot of folks in St Louis."
His friend was last seen wearing a "blue/green scrub shirt and scrub pants, no shoes and socks."
A fundraising page on GoFundMe has also been setup to raise the funds needed to get a private investigator on the "critical" case.
The page's description reads: "Unfortunately, leads to date have not materialized locating Andy. While we are disappointed, we remain undeterred. We have increased our GoFundMe goal in this critical time to find Andy and are redoubling efforts to hire additional private investigators, fly drones, advertise, pound the pavement, and search the woods, parks, and waters where Andy may be. (sic)"
Anyone with information on his whereabouts are being asked to call New York Missing Persons Clearinghouse at 1-800-346-3543.