1 of 14
The Little House on the Prairie star died Feb. 3 at 89. Born in Zion, Ill., Bull began his acting career with stage roles at the Goodman Theater in Chicago. In the 1960s, he starred as Doc on ABC's Voyage to the Bottom of the Sea before landing the role of Nels on Little House in the Prairie. Bull played the character from 1974 to 1983.