What has happened to Johnny Crawford from The Rifleman?

Johnny Crawford, known for his role as Mark McCain on the Classic Television series "The Rifleman," passed away on April 29, 2021, at the age of 75. He had been diagnosed with Alzheimer's disease in 2019, which affected his health in his later years. Crawford was also a successful musician and a member of the original Mickey Mouse Club. His contributions to entertainment and his iconic role on "The Rifleman" are fondly remembered by fans.