Jesus Angel Zavala was seen about 6 p.m. walking in the 7300 block of Chaucer Place, near West Camp Wisdom Road and U.S. Highway 67.
Zavala has made threats to harm himself and is a danger to himself and others, police said.
He is a 5-9 Hispanic man who weighs about 140 pounds. He has brown hair and brown eyes. He was last seen wearing a white T-shirt, gray shorts and black shorts.
Anyone who sees Zavala is asked to call 911 or Dallas police at 214-671-4268.