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At the scene of a car crash, Anna Dillon, a former Navy hospital corpsman gives aid to the injured; one (a Navy petty officer) dies, and two survive; Gibbs and company investigate; Dillon thinks that she saw an SUV leaving the site; local authorities arrest her for practicing medicine without a license. Abby confirms a transfer of paint; the gang soon find the owner of a recently disappeared pickup truck. They later find a connection between the dead sailor and the owner of the truck, then find the truck (with a topper) with the suspect, dead apparently of suicide; however, Ducky says that the supposed suicide was a staged one to disguise a prior injury; the team find an oversize wrench, and Abby identifies the killer. Meanwhile Gibbs finds a volunteer attorney for Dillon, whom the parents of the victims vigorously support; the lawyer makes a good deal for Dillon, and Gibbs encourages her to obtain civilian training so that she can help more people.