Michael O'Hare, who played Commander Jeffrey Sinclair on BABYLON 5, died Friday after suffering a heart attack five days earlier. He was 60.J. Michael Straczynski, who created the series, announced the news via Facebook. "I regret that I must convey the sad news that Michael O'Hare passed away today," Straczynski wrote Friday. "He suffered a heart attack on Sunday and was in a coma until his passing this afternoon. This is a terrible loss for all B5 fans and everyone involved with the show wishes to convey their condolences to the O'Hare family. He was an amazing man."