A necklace bomb explodes, killing a Colombian businessman and a bomb technician (Lou Beatty Jr.) who was Horatio's former mentor. The murders cause Horatio to become emotionally involved in the case, which worries Megan, especially after a second bomb is discovered. Moreno: Joe Renteria. Julisa: Jessica Ferrarone. Katrina: Mercedes Colon. Berenger: Conor O'Farrell. Lauriana: Liz Alvarado. Megan: Kim Delaney.