Jerry Doyle — best known for his role on "Babylon 5" — died Wednesday … TMZ has learned. Sources tell us … a call was made to his Las Vegas home yesterday afternoon after he was found unresponsive. It's unclear how the political radio talk show host and actor died … but we're told no foul play is suspected. An autopsy is pending. Jerry starred as security officer Michael Garibaldi from 1994 to 1998 and was married to co-star Andrea Thompson from 1995 to 1997. He worked on Wall Street before going into acting.