In a letter addressed to the judge, Victor Marrero, Gupta expressed regret for his role in the purported assassination plot. Indian national Nikhil Gupta has reportedly told a US federal judge that he acted alone in the alleged assassination plot targeting Khalistani separatist Gurpatwant Singh Pannun. Nikhil Gupta, accused in the Gurpatwant Singh Pannun assassination plot, has written to a US judge, admitting he planned the attack alone and detailing his psychological.