Martinez, 47, was last seen Sunday, January 24, in the parking lot of a Home Depot on the 800 block of West 182nd St. in the City of Gardena.
Martinez was seen getting into a red Dodge truck, with a driver described as a white male.
Since that date, Martinez has not contacted friends or family.
Martinez is described as a male Latino, 5 feet 4 inches tall, weigh approximately 160 pounds. He has brown hair and brown eyes.
Martinez also goes by the alias Fidel Cisneros.
Anyone with information is asked to call LAPD Missing Persons Unit Detective Kristin Merrill at (213) 996-1800.
Anonymous call may be made to Crimestoppers at 1-800-222-TIPS (800-222-8477).