relationship with Nina and eventually successfully proposes to her. Brian Goodman as Sean Cavanaugh (seasons 3–4; recurring, seasons 1–2, 5): the lieutenant of the Boston PD's Homicide Unit. Fiercely loyal to Jane and an old friend of Korsak, Sean is willing to bend the rules for his guys. It is later discovered that Sean lost his wife and son in a fire (set by Paddy Doyle) back when he and Korsak were rookies. Sean dates Angela Rizzoli for a period of time but they eventually break up. Idara Victor as Nina Holiday (seasons 6–7; recurring, season 5): a crime scene analyst and computer technician. Formerly a detective in Chicago, Holiday transferred to Boston Homicide to hone her analytical skills in an office-based environment. Following Nina's being shot by Alice Sands in the sixth-season finale, Frankie Rizzoli begins a romantic relationship with her in the seventh season, and later successfully proposes to her in the finale. Adam Sinclair as Dr. Kent Drake (season 7; recurring, season 6): a lab technician, and Maura's new assistant starting in the sixth season. He is a Scot with a military background, having served in the Middle East. In the series finale, "Ocean-Frank", Kent is set to oversee the Commonwealth of Massachusetts' Medical Examiner's Office during Maura's sabbatical. Recurring Annabeth Gish as Alice Sands. Alice McFadden was born into a distinguished law enforcement family, but she dropped out of the police academy while Jane was enrolled. Alice was second in her class behind Jane, after having been the best at everything prior to then. This feeling of inferiority resulted in her dangerous fixation on Jane, which led Alice to turn to a life of crime. She inserted herself into a circle of tunnel residents and was able to make them do her bidding, but she ended up being arrested. After being released with help from lawyer Phillip Dayton, Alice began her revenge plans on Jane. Following a shootout at Korsak's wedding reception, Jane seemed to make a personal vendetta against Alice. Jane finally corners Alice, who has taken a teenager hostage, and shoots her dead. This leaves her team to wonder if Jane shot her in the line of duty or as an act of vengeance. Tina Huang as Susie Chang, the senior criminalist of the Boston Police Department's crime laboratory. She has described herself as having a very physical memory. For example, when circumstances required