Gemmill's stint on Murder stems from his overall deal with 20th TV. Gretchen Berg and Aaron Harberts, who also are under an overall deal at the studio, have come aboard the series as co-executive producers.
Based on James Patterson's series of mystery books, Murder revolves around four girlfriends (Angie Harmon, Laura Harris, Aubrey Dollar, Paula Newsome) who solve tough murder cases.
On the show, Gemmill will serve as an executive producer alongside Liz Craft and Sarah Fain, who penned the pilot script, as well as Patterson, Brett Ratner and Joe Simpson.
Gemmill's series credits also include Fox's Jonny Zero, which he created, as well as CBS' Smith and JAG.