Eddie Cahill was born in New York on January 15, 1978. With Italian and Irish decent, Eddie is the second born to his parents, having one older and one younger sister. He graduated from Byram Hills High School in Armonk, New York in 1996. Eddie appeared in Nicky Silver's Off Broadway play The Altruists in 2000. He made his move onto TV screens in June of 2000 guest starring opposite Sarah Jessica Parker in Sex and the City. He made his big break in October of 2000 winning the role of Rachel's assistant in Friends. Eddie's other TV appearances include Charmed, Felicity, Law & Order: SVU.

In 2001 Eddie signed a holding deal with The WB Network to star in his own TV show. Glory Days, debuted in 2002 but, while well received by critics and viewers, it did not last long. Not discouraged, Eddie went on to make appearances in the series Haunted and Dawson's Creek.

In 2004 Eddie made his leap onto the big screen in Disney's Miracle playing his childhood hero Jim Craig. He continued his movie career in 2005 appearing in the movie Lords of Dogtown.

Also, in 2004 Eddie joined the cast of the newest addition to the CSI franchise CSI: New York. He can be seen playing Detective Don Flack every Wednesday on CBS at 10/9 central.