Houston police searching for missing person reportedly diagnosed with dementia (Houston Police Department) Authorities are looking for 73-year-old Riley Clarence Whitley. Whitley was last seen in the Houston Medical Center on Wednesday. He was last seen wearing a gray T-shirt, a blue jean jacket, blue jean pants, and brown boots. If you have any information on Whitley’s whereabouts, contact the Houston Police Department Missing Person’s Unit at (832) 394-1840 or (713) 884-3131.