Mark was born in Boston, MA to the late Percival and Sybil Keith on September 19, 1926. He attended Pinkerton Academy and trade school before joining the service.
After Marrying Marjorie, they settled in Connecticut and started their family.
He leaves behind four children, Mark Keith Jr. (Laura), Gayle Melson (Gary), Doreen Berry, and Daniel Keith, as well as five grandchildren, Neil, Melissa, Jenna, Krista, and Jessica.
He is predeceased by one granddaughter, Heidi. He is also predeceased by his two brothers, Calvin and Arnold Keith, and a sister, Nancy Murphy.
Services are under the care of Swan Funeral Home in Clinton, CT.
Services will be private for the family at a future date.