Were you a fan of the 70's TV show Welcome Back Kotter? I was still in high school when the show came out and remember watching it plenty of times. Sad news to report but another star from the show has passed away Ron Palillo who played Arnold Horshack on the show.According to WPTV Palillo died at his home in Palm Beach, Florida this morning at the age of 63.

Palillo's Horshack was one of the most memorable characters on Welcome Back Kotter, thanks to his unforgettable hyena-like laugh and phrase "Ooh, ooh! Mr. Kotter!"

After the show ended, Palillo had other supporting TV roles, provided the voice for some animated shows such as Darkwing Duck, and in 1996, he played himself in a few episodes of the TV show Ellen. He also created the artwork for two children's books, and appeared onstage in productions of Amadeus and Guys and Dolls. His first play, The Lost Boy, was produced in 2005.

In recent years, Palillo had been a teacher at the G-Star School of the Arts for Motion Pictures and Broadcasting.

Earlier this year, Bobby Hegyes, who played Juan Epstein on Welcome Back Kotter, passed away. Now, another member of the Sweathogs is gone.

Check out these YouTube videos.