'Chicago PD': Sophia Bush protects and serves in new clip

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Beloved "One Tree Hill" alum Sophia Bush has graduated to the streets of Chicago. A new promo for "Chicago PD" focuses on her character Erin Lindsay's role in the new NBC drama.

When she was cast, Erin was described as "a member of the CPD investigative team who has an 'unexpected past.'" In this video, courtesy of PopSugar, fans can see Bush's softer side as Erin and also how she's a competent cop.

"Chicago PD" premieres on NBC on Jan. 8 at 10 p.m. The series also stars Patrick Flueger, Jon Seda, Jesse Lee Soffer and Jason Beghe.

Photo/Video credit: NBC