Eric Delko and Calleigh Duquesne are the oldest members of Horatio's team. An underwater recovery and ballistics expert respectively, Eric and Calleigh share a long, complicated history of friendship and often a bit of ambiguity. We saw Eric sitting back and exhibiting a little jealousy everytime Calleigh talked to John Hagen, and as Eric's feelings for Calleigh developed and came to the forefront, his discomfort and perhaps disapproval of Calleigh's current boyfriend, Jake Berkeley, became evident. We saw Calleigh exhibiting a little bit of jealousy as well when she thought Marisol (Eric's sister) was actually his girlfriend, and though Calleigh can be seen as emotionally closed off, she has never hesitated to express that her trust for him runs deep. Mostly, these are the only two characters on the show who have constantly been there for each other, supporting each other through their worst trials.