yes he should be hanged for the simple reason that he killed people in mumbai, and also he should be hanged for if at all he is not given capital punishment then the expenses to take care in the jail will be heavy on the indian side. which is not reasonable stating the expenses already incurred in extraditing the person and not giving the capital punishment which he rightly deserves. and moreover what point is there after having a trial and you cant give a capital punishment as per laws and dance to the tunes of another country . if at all the death penalty is not given than better u handover the person to the same country who will take care of him and the take the ex penses also to maintain is life till death. we cant take the burden of acriminal giving him the punishment to slog in our country in jail and our jails are not better equipped also and allowing the courpt officers to safe guard his interest and practice unlawful activities from our jails inside the country . hence death penalty is must or you handover the person back to the same country.
