THE “CSI” lab is getting another staff shake up.

Executive producer Naren Shankar has confirmed that CSI Riley Smith (Lauren Lee Smith) is not returning for the series’ 10th season, reports TVGuideMagazine.com. It seems that Riley, who was introduced last season as a replacement for Sara Sidle (Jorja Fox), just wasn’t meshing well with the rest of the cast.

Riley’s departure leaves room for Sara’s return.