If you enjoyed the two episodes of “NCIS: Los Angeles” that delved into Special Agent G. Callen’s (Chris O’Donnell) mysterious past, you won’t want to miss the next two episodes of the CBS drama. In them, the book is opened on the life-changing incident that had the biggest effect on shaping Kensi Blye (Daniela Ruah) into the woman/agent she is today: the mysterious death of her father.