Derek Whitaker
| Played by | Danny Mastrogiorgio |
| Name | Derek Whitaker |
| Status | Deceased |
| Residence | New York, NY, U.S. |
| Family | Theresa Whitaker - Niece Elizabeth Whitaker - Ex-wife |
| Appearance | “Ghosts” |
Derek Whitaker was Elizabeth Whitaker's ex-husband and Theresa Whitaker's uncle.
He conspired with Calhoun to have his brother-in-law and his whole family killed for a piece of land, but his niece, Theresa, survived.
When Calhoun found out about Theresa's survival, he sent an assassin, IRS, to finish the job. To try and make amends for his past mistake, he withheld information of where Theresa was hiding even after IRS tortured him. He was shot and killed by IRS.