Why did Larry Mondello leave the Leave it to Beaver show?

Leaving in the Middle

There are many actors and actresses who have left successful television shows in the middle of their runs. One of the biggest we can look at is Shelly Long leaving the series Cheers after the fifth season. Another big example was actor Dick York who played Darrin Stephens on Bewitched being replaced by Dick York. As for 1950s and 19…