The singer/actress, who was one of the original members of the R&B girl group, has booked a recurring role on the upcoming second season of the medical procedural, which follows Chestnut as a top private pathologist.
The role marks her first major role on network TV following stints on Treme, Single Ladies, and Dwayne Johnson's Ballers.
News of Luckett's new role comes weeks after reports surfaced she had divorced her husband, motivational speaker and author Rob Hill, Sr..
The two allegedly tied the knot in January (16) and split about two months later, but other reports suggest they never made it down the aisle at all.
The former couple revealed its engagement on New Year's Eve (31Dec15).