Credits
| Year | Title | Role | Notes |
|---|---|---|---|
| Stage | |||
| 1999 | Gramercy Park is Closed to the Public | Dex | Powerhouse Theater |
| 2000 | The Altruists | Lance | Vineyard Theatre |
| 2011 | I Need a Quote | Salesman | Atlantic Stage 2 |
| 2012 | 3C | Terry | Rattlestick Playwrights Theater |
| Television | |||
| 2000 | Sex and the City | Sean | Episode 3.04 "Boy, Girl, Boy, Girl..." |
| 2000–2001 | Friends | Tag Jones | Episodes 7.04 "The One with Rachel's Assistant", 7.05 "The One with the Engagement Picture", 7.08 "The One Where Chandler Doesn't Like Dogs", 7.09 "The One with All the Candy", 7.12 "The One Where They're Up All Night", 7.14 "The One Where They All Turn Thirty", and 8.02 "The One with the Red Sweater" |
| 2000 | Charmed | Sean | Episode 3.05 "Sight Unseen" |
| 2000 | Felicity | James | Episodes 3.09 "James and the Giant Piece", 3.10 "Let's Get It On" aka "Final Touches", and 3.11 "And to All a Good Night" |
| 2001 | Law & Order: SVU | Tommy Dowd | Episode 2.17 "Folly" |
| 2002 | Glory Days | Mike Dolan | All nine episodes |
| 2002 | Haunted | Nicholas Trenton | Episodes 1.07 "A Three-Hour Tour" and 1.09 "Simon Redux" |
| 2002 | Dawson's Creek | Max Winter | Episode 6.09 "Everything Put Together Falls Apart" |
| 2004–present | CSI: NY | Det. Don Flack | All 189 episodes |
| Film | |||
| 2004 | Miracle | Jim Craig | Bill Ranford doubled for most of the on-ice action. |
| 2005 | Lords of Dogtown | Larry Gordon | |
| 2008 | This Is Not a Test | Robert Forte | Cahill worked with CSI: NY castmates Hill Harper and Carmine Giovinazzo. |
| 2008 | The Narrows | Nicky Shades | Cahill was burned when a special effect went wrong. |
| Other | |||
| 2004 | The Making of "Miracle" | Himself | Video short documentary |
| 2004 | From Hockey to Hollywood: Actors' Journeys | Himself | Video short documentary |
| 2008 | CSI: NY – The Game | Det. Don Flack | Video game (voice only) |
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