British detective Richard Poole (Ben Miller) is assigned to investigate the murder of a British police officer on the fictional Caribbean island of Saint Marie. After he successfully finds the murderer, he is reluctantly required by his supervisors to replace the victim and stay on as the detective inspector (DI) of the island, solving new cases as they appear, and being the object of many fish - out - of - water jokes. At the start of Series 3, Poole is killed and maladroit London detective Humphrey Goodman (Kris Marshall) arrives to investigate the death of his strait - laced predecessor. He then stays in the job as chief investigator on the island. In the second half of Series 6, he resigns so he can stay in London with his new girlfriend Martha Lloyd. His replacement on Saint Marie is DI Jack Mooney, played by Ardal O'Hanlon.
who is the new detective in death in paradise
DI Jack Mooney, played by Ardal O'Hanlon