Aahoo Jahansouz "Sarah" Shahi was born in Euless, Texas, to an Iranian father and Spanish mother.
While working as an extra on the set of Dr. T and the Women in Texas, Shahi met director Robert Altman, who encouraged her to move to Hollywood, where she received roles in several series, including Alias, Dawson's Creek, Reba, and Supernatural. She may be best known for her role as DJ Carmen de la Pica Morales on The L Word, which she joined in its second season. Shahi did not renew her contract with the series for the fourth season, and consequently her character was written out. She also played Farah in the second season of Sleeper Cell, and also appeared in HBO's The Sopranos, in the Season 6b episode "Kennedy and Heidi" as "Sonya Aragon", a stripper and college student who spends a weekend with Tony after a death in his family.
In October 2009, Shahi landed the lead role in the USA Network pilot, Facing Kate. Shahi began filming in November 2009. The show follows the life of Kate Reed, a legal mediator who is frustrated with the bureaucracy and injustice she witnesses in the legal system. The series title was later changed to Fairly Legal.
Shahi was cast as a recurring love interest for Taylor Kinney's character Lt. Kelly Severide on NBC's show Chicago Fire in October, 2012. Sarah is currently starring as Sameen Shaw on Person Of Interest.