Donald Pesterfield was last seen on 12/23/17 around 1830 hours when he dropped off his wife at the Mesa Gateway Airport. He called his wife and told her he was lost and hasn't been heard from or seen since. Donald is driving a dark grey 2007 Chevy Silverado 4 door truck with a tan o cover and Oregon license plates 764CTG. Donald is not answering his phone and it last pinged in the area of Bishop, CA around 1815 hours. His family is very concerned for his welfare, especially since Donald does not have his medication with him. Donald has early stages of Alzheimers. Donald has a heart that goes into AFIB and he does not have his medication with him. Donald is bald with some grey hair. He was last seen wearing a red plaid shirt, shorts and a blue baseball cap. On 12/26/17 Mr. Pesterfield was located by Las Vegas Metro Police Department at a Casino in good health. The Silver Alert is deactivated.