She then studied at the American Conservatory Theater, earning a Master of Fine Arts degree.
Belknap joined the cast of the long-running crime drama CSI: NY as Detective Lindsay Monroe in 2005 during the season two's episode, "Zoo York".
In 2004, Belknap married Eric Siegel, a colleague from the Rude Mechanicals Theater Company in New York.
[5] She also left to go home to Montana in an episode to testify in a trial to cut her screen time.
[7] Belknap was the recipient of the 2002 San Diego Theater Critics Circle's Craig Noel Award for Outstanding Performance as Marina in the Old Globe Theatre's production of Pericles by William Shakespeare.