Happy Birthday to the late, great Harold Ramis

I knew that he died not too long ago. I think I found out from either here on IMDB or Face Book. He was excellent in "Ghost Busters" and especially in "Stripes", where he starred with the late, great John Candy. I believe that he wrote "National Lampoon's Animal House" with one or two others. He was multi-talented and sorely missed. :( Also, does anyone know what he died of? I couldn't understand the illness listed here. RIP, Harold. Thank you for all the laughs.