Another celebrity death and this one involves another member of the Welcome Back Kotter cast.
Exerpts from the link:
Ron Palillo, best known for his role as Arnold Horshack on the 1970s TV sitcom "Welcome Back, Kotter," had died, the Palm Beach Post reports. He was 63.
He played the goofy Horshack from 1975 to 1979 on "Kotter," which starred Gabe Kaplan as a hip but beleaguered teacher who presided over a classroom that also included a young John Travolta.
Palillo said he came up with Horshack's trademark, an overly excited "ooh ooh!"