In his biography, it is said that Eddie Cahill was born in the state of New York in New York City. He is a middle child in the family of three and he has an older and a younger sister. He is of the Irish descent from the father who is a stockbroker and the mother is of the Italian descent who works as elementary school teacher. Cahill graduated in the Armonk area in the Byram Hills High School in 1996. He went to Skimore College of Saratoga Springs in the city of New York and then went to Atlantic Theater Acting School. It is the part of the Tisch of The arts at NYU.

In the year 2000, Eddie Cahill performed in off-Broadway production of Nicky Silver called The Altruist. Afterwards, he started to appear in other tv shows like Law & Order: Special Victims, Felicity and Sex and The City. He was a guest star who appeared many times in the NBC sitcom called Friends where he was a young assistant of Rachel and his boyfriend called Tag Jones. In the year 2002, he was in the short lived WB drama called Glory Days.

In the year 2004, he was in Hockey movie called Miracle and he was able to play his hero in the Boyhood called Jim Craig. He had never played as a goaltender position before the movie but the goal action sequences that he did was filmed by the goalie Bill Ranford who played in NHL before and he was doubling Cahill. However, he was able to shoot some key sequences while in the goal.

When CBS agreed to create a new CSI series to add to the franchise, Cahill got hired so that he can play as snarky and cocky homicide detective called Don Flack and he was the back up for the team CSI and he got some best lines. The show had nine seasons and it has 197 episodes.

Eddie Cahill is married and his wife has been her girlfriend for a long time and she is called Nikki Uberti. They got married in 2009 in Los Angeles. The wife is a makeup artist, ex-wife to a photographer called Terry Richardson and a former model. They had a son in the year 2009. Eddie Cahill has a tattoo of the name of his wife on the right shoulder in a heart and an arrow and a swallow over it. His net worth is four million dollars and he made it from the movies’ roles he played.