Kent Drake is Dr. Maura Isles's assistant. He worked at Afganistan before coming back to Boston.
In the episode, "Sister, SisterSister Sister " Kent kisses Maura and Maura is concerned that Kent may like her (policy is that you cannot date your subordinates in the Medical Examiner's Office). Turns out, he kissed Maura to distract her from the fact that, due to his time in Afghanistan, he is traumatized at the prospect of notifying patients' families with Cause of Death. At the end of the show (spoiler), it is revealed that Kent may actually be interested in Jane Rizzoli .