*Johnny Crawford, 75, actor and singer who starred as Mark McCain on the 1958-1963 Western series ''The Rifleman''; had been diagnosed with Alzheimer's disease in recent years and died of complications from that disease and pneumonia on April 29, 2021, with "COVID-19" claimed as a cause. | *Johnny Crawford, 75, actor and singer who starred as Mark McCain on the 1958-1963 Western series ''The Rifleman''; had been diagnosed with Alzheimer's disease in recent years and died of complications from that disease and pneumonia on April 29, 2021, with "COVID-19" claimed as a cause. |