Bull, a character actor who was last seen in an 2011 episode of Boss, played Nels for almost a decade and was a prolific TV actor, reportedly appearing in over 100 different shows, including Hawaii Five-o and Bewitched.
Bull died of complications due to a pneumonia in Calabasas and he is survived by his wife Barbara Collentine.
'Little House' Co-Stars React
Little House on the Prairie co-star, Melissa Gilbert, confirmed the news on her Twitter account. Gilbert wrote her co-star of ten years a sweet goodbye and accompanied the post with a photo of Bull.
This man will be missed. Goodbye Richard working with you was such a joy but nearly as joyful as being your friend. pic.twitter.com/Oc4sBMrfbn
— Melissa Gilbert (@MelissaEGilbert) February