Renee Zellweger by Mike Marsland/WireImage.com
is bringing her star power to Lifetime as an exec producer on
, a new original movie. She's teaming up with her former Chicago
producers, Craig Zadan and Neil Meron, for the TV flick, which chronicles the true story of Dr. Denny Slamon, who developed the breast cancer drug Herceptin 2. Harry Connick Jr.
will play the lead. According to the Reporter
, Zadan and Meron brought the script to Zellweger, for whom breast cancer issues are close to the heart. Dr. Denny Slamon treated Zellweger's publicist. Living Proof
will be shot in Connick's hometown of New Orleans, and will premiere in October, as part of Lifetime's "Stop Breast Cancer for Life" initiative. - Anna Dimond