Frank Tejada is the uncle of Dru, Diana, and Cane. Uncle Frank immediately visits the Tejada family after getting released from prison out of the blue and claims that his brother Lorenzo promised him Monet would help him out. Monet doesn't believe him because she suspects Frank is a snitch so she orders Cane to kill him. This was confirmed by Tariq before Monet ordered Frank's death and after Cane killed Uncle Frank by Officer Ramirez.
He is a minor antagonist in season 1.