OKLAHOMA CITY (KFOR) — Oklahoma City Police issued a Silver Alert on Tuesday afternoon for an 81-year-old man last seen in Oklahoma City. Melvin Rose. Photo courtesy Oklahoma City Police. Melvin Rose's truck. Photo courtesy Oklahoma City Police. Police say Melvin Rose has dementia or Alzeimer's, and was last seen leaving his home in northwest Oklahoma City in a dark blue 2000 Dodge pickup truck. The tag number on the truck is EEH-141. Rose is said to be around 5'8" and 145 lbs. wearing a gray or tan t-shirt and blue jeans. If you see Rose, please call 911.