This episode marks the first appearance of Arastoo Vaziri (Pej Vahdat), a recurring intern ("squintern") known for being a practicing Muslim.
A red thread found on the victim's sweater was traced to the interior of a BMW sedan, which Dr. Fitts owned. [S4E17] The Salt in the Wounds
The investigation begins when a is discovered buried in a mound of salt within a city de-icing truck. Dr. Temperance "Bones" Brennan identifies the victim as Ashley Clark , a 16-year-old high school volleyball player who had been missing for three weeks. This episode marks the first appearance of Arastoo
The team identifies the killer as , a chiropractor. Evidence linking him to the crime included: [S4E17] The Salt in the Wounds