Richard Bull, a character actor who played shopkeeper Nels Oleson on the 1974-83 TV favorite Little House on the Prairie, died Monday. He was 89. "This man will be missed," the show's star, Melissa Gilbert, Tweeted. "Goodbye Richard working with you was such a joy but nearly as joyful as being your friend." Bull was born in Zion, Ill., on June 26, 1924, and in 1948 married actress Barbara Collentine, according to a 2009 Yahoo biographical sketch. On the NBC show about the Ingalls family in the American West of the 1800s, actress Scottie MacGregor played Bull's wife, Harriet Oleson,...