BOISE, Idaho (AP) — Idaho sheriff's deputies say a man who won a settlement from Corrections Corporation of America after he sued over prison violence is missing and believed to have drowned. The Valley County Sheriff's Office says 51-year-old Marlin Riggs may have driven his Ford F-150 pickup off a rural road and into a creek near Yellowpine sometime last weekend. The submerged pickup was found Saturday morning, but no one was inside the vehicle. Lt. Dan Smith with the sheriff's office says Riggs is presumed drowned. Riggs was part of a group of inmates who sued the private prison company, contending the Idaho Correctional Center was so violent that it was nicknamed "Gladiator School." Riggs sought $55 million from CCA. A settlement was reached, but the terms of the agreement were sealed.

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