iHeartRadio and 24/7 Comedy pay tribute to a giant of comedy, Robin Williams.

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Tom MorelloFlea, and Ozzy Osbourne are among the many rock stars mourning the loss of Robin Williams. 

[Get The Story: Robin Williams Dead of Apparent Suicide]

The Oscar-winning actor and comedian died Monday of an apparent suicide at the age of 63.  Osbourne called it a "tragic loss," and says he will "always have amazing memories" of Williams. 

[PHOTOS: Remembering Robin Williams]

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