Relatives found his sandals on the beach. The local fire department searched the water but didn't find anything.
His family and friends say it's not like him to just disappear.
Hosty is a teacher at Roberto Clemente High School in Chicago. And the search is now moving from Michigan to the city.
His friends put up fliers Friday night at some of the Lincoln Park bars Hosty's been known to visit.
Family members say Hosty was last seen at 3 a.m. Sunday inside his family's lakefront residence on the outskirts of Coloma, Michigan in Hagar Township.
Hosty is approximately 6'5", 210 pounds, with curly brown hair and brown eyes. At the time of his disappearance, Hosty was wearing blue striped pajama pants, an orange t-shirt with "blame rob" across the chest in white lowercase type and a Kelly green White Sox hat with a Miller Lite logo on the back. He has a small green shamrock tattoo on the inside of his ankle.
If you see a person fitting his description or know anything about his whereabouts, contact the Berrien County Sheriff's Department at 269-983-7111.
Hosty was raised in River Forest with his father, Robert, his mother, Peggy and his older sister, Alice. He attended St. Luke Grammar School, Lincoln School and Roosevelt Junior High School in River Forest. He graduated from Fenwick High School in Oak Park in 1998, where he played football and was a member of the bowling team. He graduated from the University of Illinois at Chicago in 2004 with a degree in Spanish and History.