Authorities are looking for a man with special needs who was last teen last weekend in Tomball. Keith Houghton was last seen about 11 p.m. Saturday in the 9900 block of Diego Springs Drive. The 29-year-old man needs medication, officials with the Harris County Sheriff's Office said Monday. Houghton is black, about 5 feet, 5 inches tall and weighs about 185 pounds. Authorities said they were uncertain what he was wearing when he left the residence. Anyone with information should contact the sheriff's office homicide-missing persons unit at 713-755-7427 or Crime Stoppers at 713-222-8477.