Richard Bull

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Richard Bull played Nels Oleson, husband to Harriet who, with her, owned the town mercantile store.

Bull began acting in the 1950s, landing parts on shows like "Perry Mason," "Highway Patrol," "The Virginian," "The Fugitive," "The Alfred Hitchcock Hour," "Gidget," "Gomer Pyle: USMC," "The Andy Griffith Show," "Bewitched," "Mission: Impossible" and "Bonanza" before the show’s run.

He also starred as the doctor on "Voyage to the Bottom of the Sea" from 1964 to 1968.

He continued to act until 2011 on shows like "Lou Grant," "Knots Landing," "Hillstreet Blues," "Designing Women" and "ER."

Bull died at 89 years old in 2014.

He also reunited with Landon on three episodes of "Highway to Heaven."