Federal immigration authorities allowed a suspect in a $100m jewelry heist believed to be the largest in US history to deport himself to South America in December, a move that stunned and upset prosecutors who were planning to try the case and send him to prison.

Jeson Nelon Presilla Flores was one of seven people charged last year with stalking an armored truck to a rural freeway rest stop north of Los Angeles and stealing millions worth of diamonds, emeralds, gold, rubies and designer watches in 2022.