OKLAHOMA CITY (KFOR) — The Oklahoma Highway Patrol has issued a Silver Alert for a missing woman last seen in Oklahoma City. According to OHP, Diane M Sullivan is 67-years-old, 5'7" and 120 lbs. She was last seen on foot in Oklahoma City wearing a blue, white, and orange jacket, blue jeans and possibly red slippers. Silver Alert for Diane M Sullivan. Image courtesy Oklahoma Highway Patrol. Authorities say Sullivan suffers from dementia. If you see Sullivan, please call 911.