Los Angeles so soon after he first appeared and the reason behind his exit is both shocking and disappointing.

This is the same Lily Agent Parker saw when he almost died during the NCIS Season 21 finale ... Below is an image from the new episode (Moonlit) featuring an unnamed actress guest-starring that night.

NCIS might be about solving military-related crimes, but audiences have stuck around for 22 seasons because of the show's cast of characters ... However, Siddall died in 2018 before their divorce ...