As a teenager, Sean Hayes was an extra in Winona Ryder's first movie Lucas (1986) - filmed at Sean's High School in Glen Ellyn, Ill.
Attended Illinois State University in 1992, where he studied music and theatre.
Wanted to start a spin off series of "Will & Grace" (1998), but after seeing what happened to "Joey" (2004) on NBC, he decided against it.
He is the youngest of the "Will & Grace" (1998) cast.
He saved a man's life in 2001. Courtney Cunninghan, 33, reported that two men stopped him near the driveway of his Los Angeles home, and then robbed him and shot him in the leg. Hayes who was driving in L.A.'s mid-Wilshire district when he noticed Cunningham lying in the street. The actor then pulled over to help the victim, ripping off his shirt and pressing it against Cunningham's wound to stop the bleeding. He then called 911 on his cell phone and waited for paramedics to arrive.
Was listed as a potential nominee on the 2004 Razzie Award nominating ballot. He was suggested in the Worst Supporting Actor category for his performance in the film Dr. Seuss' The Cat in the Hat (2003), however, he failed to receive a nomination.
Close friends with actress Rosa Blasi; attended her wedding to Giants Fullback Jim Finn on February 14, 2004.