The Sheriff’s Department is asking for the public’s help in locating a missing Yucca Valley man. George “Marty” McKissen left his home in the 56800 block of Little League Drive about 9:30 Friday morning to ride his blue “Huffy” mountain bike, and never returned home. McKissen has the mental capacity of a 12-year-old and may act shy around strangers. Marty McKissen was last seen wearing a black leather jacket, dark jeans, a black baseball cap, and brown boots. Reverse 911 calls were sent to landline phones in the area asking for help in finding McKissen. Anyone with information should call the Sheriff’s Department at 760-366-4175.