Douglas James Pearse, 86, was last seen in Modesto, California on April 21, 2005. A retired nuclear and chemical engineer and a well known school volunteer who often worked 50 to 60 hours a week, he was scheduled to volunteer at Woodland Elementary and Mariposa Middle School the day after he disappeared but never arrived.

A few days later his 1990s Ford Ranger was found stuck in the mud and burned on Chowchilla Mountain Road near Summit Camp in Mariposa County. There was no sign of Pearse at the scene. Authorities suggested the fire may have been accidental and proposed he might have become lost while trying to walk out of the mountains after the truck became stuck. He was described as a white male, 5 feet 10 inches, 160 pounds, with gray hair and gray eyes, and may have been wearing a white cowboy hat.

About 60 search and rescue personnel from Mariposa, Fresno, Madera and Yosemite National Park, plus hundreds of volunteers, conducted an extensive search that was suspended on April 30, 2005; officials said operations would resume if new information emerged. His disappearance remains unsolved.

If anyone has information about where Douglas was between April 21 and the days after, please share tips with investigators.