Jorja Fox’s on-again. off-again relationship with “CSI: Crime Scene Investigation” flipped to on-again, as CBS announced she will return to the series as a regular this fall.

After seven seasons as a regular – and several contract disputes – Jorja left “CSI”, but she and her character, Sara Sidle, soon returned to the show as a recurring guest star for the next four seasons.

It’s the second major cast change for “CSI,” which announced last week that Ted Danson would join the cast, replacing Laurence Fishburne.

The audience for “CSI” has shrunk considerably the past two seasons, as the show has sunk from a regular Top 5 performer to No. 12 in the annual ratings list – still good, but clearly trending in the wrong direction.

More important than the cast changes may be the new night and time: After a decade at 9 p.m. Thursday, “CSI” will shift to 10 p.m. Wednesday when its new season begins Sept. 21.