In "Shalom", the fourth season premiere, she is framed by Iranian agents for the murder of two FBI officers and a suspect in their custody who was wanted for crimes against Israel. Accused of being a double agent, she becomes a fugitive and is forced to ask for help from Gibbs, who had retired from NCIS at the end of season 3 and is living in Mexico. They ultimately prove her innocence, and this event prompts Gibbs to return to NCIS.