James "Jim" Nelson was an NCIS Special Agent who was working on Paula Cassidy's team at the time of his death and the two were meeting a contact who had information regarding a potential terrorist attack before being led into a warehouse that exploded seconds later, killing both Agents instantly.
Before that, Nelson had been married for two months to his wife Amy at the time of his death, something that Director Jennifer Shepard mentioned while she was calling the two dead agents's families to inform them of the tragedies.
Before joining NCIS he was a friend of Timothy McGee. According to McGee, the two met at FLETC and McGee credits being able to gradute from FLETC to Nelson, saying that he wouldn't have graduated without Nelson's help. The two continued their friendship. McGee was invited and attended Nelson's wedding two months prior to his death.