NBC's Aquarius is adding a new face for season two.

Stewart will take on the series regular role of Tex Watson, a Texas high school honor student-athlete who crosses paths with Charles Manson (Gethin Anthony) while becoming consumed in the psychedelic, drug-dealing Los Angeles lifestyle, all leading to the involvement of the Cielo Drive and LaBianca murders.

The actor joins a season two cast that also includes Ray Donovan's Omar J. Dorsey, who will recur as Ralph Church, a smart, powerful and intimidating ex-convict who towers over Charles Manson. 

Production on season two is under way in L.A. A premiere date has not yet been determined.

Stewart's credits include Baby Daddy, iCarly and Pitch Perfect. He's repped by APA and Millennium Artists.