Original C.S.I. cast member Marg Helgenberger headed back on the beat with ‘CSI: Vegas’ Friday, February 11 by ABC NewsWhile William Petersen's Gil Grissom and Jorja Fox's Sara Sidle won't be returning for the second season of CBS' hit C.S.I. reboot, another familiar face will be. Marg Helgenberger, currently co-starring on the OWN legal drama All Rise, will return as crime scene investigator Catherine Willows when C.S.I. Vegas returns this fall, ABC... Read More.