NCIS Season 7 Episode 22

Loner Afghanistan vet Marine corporal Ray Collins's corpse is found dumped in a junkyard car, both feet amputated, first knocked out and branded in the face. He was court-martialed and discharged for various crimes, affording a luxury motorcycles collection. He was apparently the latest victim of a serial killer of victims with motorcycle gang tattoos, collecting their salted feet. Abby is invited by Justice liaison Alejandro Rivera to address a Mexican forensic symposium in Benito Juarez, escorted by McGee. They meet the Reynosa cartel, trying to solve drug trader Pedro Hernandes's cold murder case. She's shocked to find a link to Gibbs's past. Tony vents dating website frustrations. The team works out that Collins probably murdered the others, plausibly explaining why he alone was alive when his feet were amputated, the others were Reynosa drug dealers, poisoned and the rest of their corpses acid-consumed.