The 36-year-old actor and musician began his professional career in theater in his hometown of Chicago. He served as musical director of the nearby Pheasant Run Theater for a few years.
After moving to Los Angeles, Hayes appeared as a stand-up comic. He landed his part in "Will and Grace" in 1998 and appeared on the show for all eight season.
Hayes starred as Jerry Lewis in the television movie "The Martin and Lewis Story."
He's appeared in the feature films "Pieces of April," "Win A Date With Tad Hamilton" and "The Cat and The Hat."