Regina King as Lydia Adams and Dorian Missick as Ruben Robinson

Detective Lydia Adams (Regina King) is smart and perceptive, possessing excellent investigative instincts.  Working in the homicide division after previously spending two years in the gang unit, she is one of the sharpest detectives around. She is sometimes impaired, however, by the emotional connection she holds to the cases she handles, as well as her insistence on doing things her own way. Lydia has gone through numerous partners over the past few years. But she may have finally found the right fit in new partner Ruben Robinson (guest star DORIAN MISSICK), a former Marine and detective-in-training who seems eager to let Lydia take the lead.

Ruben Robinson (Dorian Missick) is Detective Lydia Adams’ new partner and a detective trainee. Born and raised in Los Angeles, he joined the Marines and served two tours in Afghanistan. He and Lydia seem to speak the same language and work well together. Considering Lydia to be very wise when it comes to doing the job effectively, he hopes to learn as much as he can from her. A family man, with a wife and three kids, Ruben doesn't define courage as facing danger and overcoming it. He defines courage as being able to get up the next day to do it all over again.