| | Ed | Kapenash | Nantucket Chief Of Police. |
| | Andrea | Kapenash | Ed's wife. |
| | Chloe | MacAvoy | Finn's twin sister. One of the caterers. |
| | Finn | MacAvoy | Tess's son. |
| | Greg | | Tess's husband. |
| | Lola | Budd | Finn's girlfriend. |
| | Dickson | | The sergeant. |
| | Merritt | Monaco | Deceased. Celeste's maid of honor. |
| | Roger | Welton | A Wedding coordinator. |
| | Cash | | One of Ed's police. |
| | Elsonhurst | | One of Ed's police. |
| | Jordan | Randolph | Nantucket's news editor. |
| | Greer Garrison | Winbury | Mother of the groom. |
| | Tag | Winbury | Greer's husband. |
| | Benji | | Greer's son. The groom. |
| | Celeste | | Benji's fiance'. |
| | Thomas | Winbury | Greer's eldest son. |
| | Abigail | Freeman | Thomas's wife. |
| | George | Strait | A country singer. |
| | Bruce | Otis | Celeste's father. |
| | Karen | Otis | Celeste's mother. AKA: Betty. |
| | Featherleigh | Dale | Tag's friend. An Antique collector. |
| | Jessica | Hicks | The jeweler. |
| | Dolly | Hardaway | Protagonist on Greer's books. |
| | Tracy | | The backstroker. |
| | Mr. | Allen | The store's general manager. |
| | Dr. | Edman | Karen's oncologist. |
| | Shooter | Uxley | Benji's best man. |
| | Nicholas | Diamantopoulos | The police detective. AKA: Greek. |
| | Randy | | One of the forensics guys. |
| | Blair | Parrish | The head herpetologist at the Bronx Zoo. |
| | Donner | | One of Celeste's employees. |
| | Karsang | | One of Celeste's employees. |
| | Molly | | The milk snake. |
| | Miranda | Briar | Jules's daughter. |
| | Jules | Briar | Benji's ex-girlfriend. |
| | Zed | | Celeste's boss. |
| | Reverend | Derby | Winsbury's minister. |
| | Phil | | Nick's cousin. |
| | Andy | Briar | Jules's first husband. |
| | Sergio | Ramone | Tag's friend. An Antique collector. |
| | Gina | | The bartender. |
| | Bob | | The chief's friend. |
| | Siobhan | | The caterer. |
| | Enid | Collins | Greer's editor. |
| | Charles | O'Brien | Enid's editorial director. |
| | Alex K. | | One of Benji's friends. |
| | Alex B. | | One of Benji's friends. |
| | Alex W. | | One of Benji's friends. |
| | Zander | | One of Benji's friends. |
| | Ernie | | Tag's colleague. |
| | Robbie | | Merritt's on-and-off boyfriend. |
| | Travis | Darling | Merritt's former boss and lover. |
| | Cordelia | Darling | Travis's wife. |
| | Sage | Kennedy | The newly hired. |
| | Bethany | | Celeste's assistant. |
| | Wonder | Calloway | A writer. |
| | Marty | Szczerba | Head security of Nantucket Airport. |
| | Bonita | | Marty's assistant. |
| | Kendra | | Lola's aunt. |
| | Brenner | | The state policeman. |
| | Laura | Rae | Marty's daughter. |
| | Mary Ellen | | Lola's colleague. |
| | George | | The steward. |
| | Elida | | The housekeeper. |
| | Miss | Hillery | Tag's secretary. |
| | Geraldo | | Chloe's co-worker. |
| | Donna | | Chloe's co-worker. |
| | Kacy | | Ed's daughter. |
| | Eric | | Ed's son. |
| | Linda | Ferretti | The medical examiner. |
| | Margaret | | The ER nurse. |
| | Elida | | The Summer housekeeper. |
| | Robin | Swain | Bruce's crush. |
| | Julia | | Celeste's roommate. |
| | Margaret | | One of the nurses. |
| | Suzanne | | One of the nurses. |
| | Patty | | One of the nurses. |
| | Keira | | The Chief's assistant.. |
| | Douglas | Monaco | Merritt's brother. |
| | Valerie | Gluckstern | Uxley's lawyer. |
| | Lauren | Doherty | A physical therapist. |
| | Zoe | Stanton | A store manager. |
| | Laney | Morris | Jules's best friend. |
| | Casper | Morris | Laney's husband. |
| | Kathryn | Randall | A psychic. |
| | Dr. | Crowe | Greer's GP. |
| | Hamish | | Feather's brother. |
| | Helena | | Nick's sister. |
| | Luklo | | The police officer. |
| | Cassandra | | Shooter's mother. |
