“CSI” OG Marg Helgenberger will return to the role of Catherine Willows for “CSI: Vegas” this fall, a continuation of CBS’ long-running forensics crime franchise, and on Friday the actress revealed part of the reason you’ll see her back is because she missed her character.“When I left, midway through Season 12 of the original series, I needed to step back because I played the role for so long, and it had become such a part of my life that I felt she had become a part of my identity a little bit,” the actress said during CBS’ presentation at the Television Critics Association virtual summer press tour. “Having that perspective of being away from her and then coming back and in a big way as this, I did miss her actually.