Johnny Crawford

John Ernest Crawford (March 26, 1946 – April 29, 2021) was an American actor, singer, and musician. He first became well known as a Mouseketeer in "Mickey Mouse Club". He also became known for playing Mark McCain in the ABC Western series "The Rifleman".
In 2019, it was reported that Crawford was diagnosed with Alzheimer's disease. He died on April 29, 2021 at the age of 75.