| Courtney |
Barrow | Driver who accidentally hit Collette |
| Judy |
Blume | Novelist (mentioned) |
| Gloria |
Estefan | Singer (mentioned) |
| Officer |
Foster | Police officer who rescued Amanda |
| Mrs. |
Garret | Amanda's former patient |
| Dr. |
Harris | Amanda's favorite radiologist |
| Collette |
Jones | Narrator |
| Mrs. |
Ketcham | Amanda's next-door neighbor |
| Mr. |
Loren | Local curmudgeon and neighborhood watchdog |
| Amanda |
Morgan | Oncologist |
| Greta |
Morgan | Amanda's daughter |
| Belle |
Smith | Collette's fake name |
| Brody |
Whittaker | Hospital CEO |
| Arabella |
| Collette's sister; deceased |
| Beth |
| Mutual friend of Joe and Amanda |
| Carol |
| Collette's therapist |
| Cindy |
| Hospital receptionist |
| Gavin |
| Mysterious man in the grief group |
| Henry |
| Arabella's 8-year-old cat |
| Jackson |
| Grief group member |
| Joe |
| Amanda's boyfriend |
| Linda |
| Woman Collette met at grief counseling |
| Lucy |
| Jackson's wife; woman Amanda used in her experiment who later died |
| Mark |
| New grief group member |
| Miguel |
| Hospital cleaning staff |
| Mike |
| Collette's current boyfriend |
| Sara |
| Collette's friend |
| Vince |
| Leader of the grief support group |