Darlene returns to the show mid-way through Series 11, and is subsequently offered a role on the team by Commissioner Patterson in a civilian capacity following Florence's departure from the force.
Initially more apparently focused on political implications over individuals, such as being angered at Poole when a suspect was stabbed in the back while in Poole's custody because of the implications for public perception, he has shown signs of softening over time, such as allowing an incident where Officer Myers told a journalist that the commissioner blundered around like an old goat to be dismissed as a significant misquote, and warmly welcoming DI Jack Mooney to the island after Humphrey Goodman requests reassignment.
Over time, however, he has adopted a more relaxed attitude in this regard, content to let the detectives follow the evidence and simply offering advice rather than attempting to 'nudge' the investigation.
However, he is always willing to accept new evidence, such as the reopening of an eight-year-old murder case where it has just been revealed that the woman arrested had an alibi that went unconfirmed because her companion was visiting on holiday and left before he could be questioned, and is visibly relieved when such matters are finally resolved and the true guilty party exposed.
Very little is known throughout the show about Patterson's personal or family life until in Series 11, Episode 8, when his ex-wife, Maggie, appears on the island, who had left him years prior due to the demands of her profession as a journalist.
Poole is murdered in the first episode of Series 3, at an on-island reunion of Cambridge university classmates, by Helen Reid, when he threatened to expose her identity theft.
Poole makes a brief guest cameo in Series 10, Episode 6 when Camille returns to the island briefly to help on a case and due to her mother Catherine being admitted to hospital after being attacked.
Initially, she and Poole did not get along at all as a result of a culture clash, but over time the two began to get along better and made a good team, and their friendship even showed hints of romance.
She successfully helps the team solve the case and, following advice given to her after conversing with a memory of DI Richard Poole, decides to spend a few weeks away with Catherine to make up for not visiting her since leaving the island, after which she returned to her role in Paris.
Following DS Camille Bordey's departure halfway through Series 4, Dwayne became the last remaining original team member, apart from Commissioner Selwyn Patterson.
He subsequently helps out the team on a case after the force is left short staffed, after which he leaves the island for London to visit his now ill father.
He later reveals that the other and main reason he returned to Saint Marie was due to his father being close to death and thus wishing to spend his last days on the island.
In the team's visit to the UK, Cassell proved more willing to explore little details of life in Britain than Myers, although she still found the Guinness beer too thick for her taste.
At the beginning of episode 6, she was able to call JP and get the rest of the team there in time to get her to the hospital, but soon after they discovered Patrice had been shot dead in the boathouse - devastating Florence.
In the following series, Florence is offered an undercover police job in Jamaica and, despite some hesitancy due to the memory of Patrice still being vivid, she was willing to accept the new role and leave the island for a second time.
However, after being held at gunpoint by Mafia Boss Miranda Priestley as part of her undercover role to be accepted, Florence shot her in the arm and had to immediately leave the island under witness protection in Series 11, Episode 4, saying farewell to her colleagues.
In the following episode, with Neville due to leave to go travelling, Florence reveals to him that during her time in witness protection she came to realise that she did have romantic feelings for him after all, and states her desire to be with him.
Goodman found him one night, amidst much screaming and shock; Catherine, who had a spare room after Camille's departure, invited him to stay with her, an offer JP enthusiastically took up.
During the course of Series 10 he takes trainee officer Marlon Pryce under his wing and his wife Rosey gives birth to twin girls; Molly and Bethany.
JP later makes a guest appearance in Series 13, Episode 5, where he and the commissioner travel to Jamaica to ensure that the soon-to-be departing Marlon gets a job at the police force there in order to continue his career.
A police detective inspector from London, Jack Mooney is a recent widower, his wife having died from a long illness a month prior to his first appearance, although he gives the impression that it was longer when talking with others so that people won't feel too sorry for him.
While still just officially on holiday, Mooney assists the team in resolving a re-opened investigation into the death of a newspaper editor eight years ago, along with another case that exposed those responsible for murdering one of the candidates in the recent mayoral election.
When Siobhan left to go back the UK to attend university, Jack missed her dearly but remained focussed on his job and embraced the Caribbean lifestyle enthusiastically.
Jack decides to return to his old life in London and depart St. Marie with Siobhan, feeling he was finally ready to face the memory of his late wife.
Formerly a youth offender, Marlon joins the Saint Marie Police Force in order to avoid facing going to court and prison as a consequence for a lifetime of bad behaviour.
Their good relationship is further shown when JP steps in to protect Marlon following an incident with one of the suspects and offers to take the blame for his actions, in order to help him avoid going to prison.
In Series 13, Episode 5, Marlon decides to leave Saint Marie to take care of his younger sister, Jocelyn, after she is offered a scholarship at a school in Jamaica.
After he checked through the crime scene of his first murder case, he plans on catching another plane back to the UK, but his flight was cancelled by Commissioner Patterson.
After solving a murder case in Episode 8, he plans on flying back home, but a talk with a blind actress about her attempt to face the challenges of her condition prompted Parker to change his mind and decide to stay as inspector permanently.
In the 2022 Christmas Special, Neville, having briefly tried online dating, meets Sophie Chambers, an English traveller also from Manchester who is staying on the island for a few weeks.