is fluent in Spanish. MDPD Robbery-Homicide Division (RHD) Detective Bernstein (Michael Whaley, season 1): An African-American detective who also accompanies the CSIs to various crime scenes. MDPD Officer Aaron Jessop (Joel West, seasons 2, 4): A patrol officer, Jessop joined the force during season 2 and his first appearance was in "The Oath". While he thought like a cop, he also was able to think like a CSI. This was evident in "The Oath", where he was able to help Calleigh assess the crime scene and upped the charge and penalty. Jessop was killed when he opened a cabinet rigged with a hand grenade booby trap at the scene of a Mala Noche shootout, leaving Horatio and the other CSIs distraught at his death. (West had previously appeared as Officer Ramirez in the season 2 episode "Big Brother") MDPD Robbery-Homicide Division (RHD) Detective Jake Berkeley (Johnny Whitworth, seasons 5–8): An undercover officer with the MDPD narcotics unit. As of episode 5.12 ("Internal Affairs"), he has moved to being a robbery-homicide detective. He and Calleigh dated while they were in the Academy. At the end of season 5 and in season 6, they had again begun a relationship, but new department regulations involving officer fraternization and pressure from Rick Stetler caused Berkeley to break things off. He resumed his undercover duty in episode 8.21 ("Meltdown"), tracking a gang of diamond thieves. Relatives and friends of the CSI team Raymond Caine (Dean Winters and Chistopher Stapleton): Horatio's brother who faked his death while working undercover. Horatio was deeply in love with Yelina Salas, Raymond's wife. He is eventually reunited with his wife, Yelina, and son Ray Jr. with the three flying to Rio to start a new life for themselves. Unfortunately, Ray's attempts to get clean fail, and over time, he becomes involved with the Mala Noche and is later beaten to death by Antonio Riaz, and dies in Horatio's arms, but not before urging Horatio to save Ray Jr. Raymond Caine, Jr. (Alex Buck, Hayden Tank, and Carter Jenkins, seasons 1–5), Horatio's nephew, son of Yelina and Raymond Caine (Horatio's brother). He is first introduced in "Grave Young Men", when Horatio finds out that he has been getting into fights at school. He tells Horatio that he has been fighting because people keep calling his dad a "dirty cop", to which Horatio replies, "You know that's not true". He appears in