Notorious Calgary gangster admits to killings, in exchange for partial immunity Roberto was originally convicted of three counts of first-degree murder in the New Year’s Day 2009 shootings at the Bolsa Restaurant.Rival gangster Sanjeev Mann was killed along with Aaron Bendle and innocent bystander Keni S’ua.A new trial was ordered after new evidence surfaced that the Crown’s star witness confessed to the murders to an RCMP officer.However, before that happened, Roberto agreed to become a witness for the prosecution in exchange for partial immunity. ‘Deal with the devil’ could put a stop to Calgary’s gang war He pleaded guilty to lesser charges: three counts of conspiring to commit murder, discharging a restricted firearm with intent and.