Tristan Markey Rivera was 24 when he was last seen on August 5, 2007, in the floodwaters of the Trinity River in Irving, Texas. He was wearing a red t-shirt, plaid shorts, and red and black tennis shoes when he disappeared. Reports describe him as a biracial male with black hair and brown eyes, about 6 feet tall and 220 pounds.

Rivera is mentally disabled and prone to seizures, a factor that prompted authorities to classify his case as Disabled - Endangered. The Irving Police Department is the primary investigator (case 10-21095); the Texas Department of Public Safety lists the case as M1008005, and the National Missing and Unidentified Persons System entry is MP15538. Few details are available about why he was in the floodwaters the day he vanished.

Does anyone have information about Tristan’s movements in Irving on or around August 5, 2007, or recall seeing someone matching his description near the Trinity River that day?