The latest teaser trailer for NCIS: Los Angeles suggests that G Callen, played by Chris O’Donnell, could meet a tragic end. The trailer shows Callen receiving a call from someone who knows his true Russian name and then meeting with Howard Pembrooke, who tortured him as a child. A deadly shootout occurs, leaving Callen defenseless. The trailer ends with an explosion that could potentially involve Callen. This twist ending could be a possibility as the series is in its final season. The show airs on Sundays on CBS.