Johnny Crawford, best known for his iconic role as Mark McCain in the 1950's ABC series The Rifleman, died Thursday from COVID-19 and pneumonia. He was 75.

Johnny Crawford, best known for his role as Mark McCain, the son of Chuck Connors' Civil War vet character on the late '50s, early '60s TV show, "The Rifleman," died on April 29, 2021. He was 75 years old at the time of his death, according to Variety. He was diagnosed with Alzheimer's in 2019, and later struggled with COVID-19 and pneumonia.

Johnny Crawford, known for his role as Mark McCain in the ABC series "The Rifleman," died Thursday at the age of 75.

Johnny Crawford was an actor best known for his role as young Mark McCain on “The Rifleman.” Died: April 29, 2021 (Who else died on April 29?)