UPDATE: Body of San Francisco missing teacher believed to be found
Ed Cavanaugh was last seen July 17 riding a motorcycle with a friend in the El Dorado National Forest.
Cavanaugh's family says he's a "survivalist" but they're worried because he has diabetes and needs medication.
Cavanaugh teaches at Downtown High School, a continuation school in San Francisco.
For more information on the Fundly.com campaign to help search for Cavanaugh, click here.
Anyone with information regarding his whereabouts is urged to contact the El Dorado County Sheriff's Office at (530) 621-6600.