After turning to alcohol to cope with Bipolar Disorder and a series of personal losses, lawyer Craig Coyner ended up becoming homeless on the streets of Bend, Oregon, a town in which he once served as mayor.

He had known Craig Coyner for more than 50 years, watching with admiration as the man from one of the most prominent families in Bend, Ore., rose through an acclaimed career — as a prosecutor, a defense lawyer and then a mayor who helped turn the town into one of the nation’s fastest-growing cities.

Now, at age 75, Mr. Coyner was occupying a bed at the shelter on Second Street, his house lost to foreclosure, his toes gnarled by frostbite, his belongings limited to a tub of tattered clothing and books on the floor next to his bed.