Maria Bello exited stage right on Tuesday's episode of the CBS procedural after three seasons as Dr. Jacqueline «Jack» Sloane, when her past came back to haunt her and ended with a bittersweet goodbye for the former army lieutenant-turned-forensic psychologist in her farewell.For a minute now, Sloane had been toying with possibly leaving her post at NCIS and turning her badge in for a less grueling lifestyle on a Costa Rican beach.