The actor died Monday at his home in Los Angeles, surrounded by loved ones and family. His son, Eric, tells us, "He was an incredibly kind and wonderful father. He had his family gathered around him when he passed. He was loved and will be very missed."

Ken began his acting career when he was only 9 years old, but he got his big break in 1957 when he was cast as Eddie Haskell on 'Beaver' opposite Jerry Mathers, who played the title character.

The Haskell role was supposed to be a simple guest appearance, but Ken knocked it outta the park and his character became a series mainstay over 6 seasons and 234 episodes. As you know, Ken's portrayal of Eddie was iconic.

Osmond grew up in Glendale, CA and his first speaking role was in the movie "So Big." He also guest-starred on a ton of popular TV shows, including "Lassie," "Wagon Train, "The Adventures of Ozzie and Harriet," "The Loretta Young Show" and "Fury."

In 1970, Osmond joined the LAPD and was an officer until he retired in 1988. During one incident, he was shot at 5 times ... 4 of the bullets hit his bulletproof vest and the fifth ricocheted off his belt buckle.

Ken was typecast after 'Beaver,' but his other acting credits include appearances on "The Munsters" and "Petticoat Junction," plus feature films like "With Six You Get Eggroll" and "C'Mon Let's Live a Little."

Ken was 76.