(IDAHO FALLS) – One of the suspects involved in a Christmas Day stabbing in Ammon has entered a guilty plea. 45-year-old Adan Cisneros has pleaded guilty to a charge of aggravated assault. Cisneros was with a group of several people allegedly involved in the killing of 20-year-old Buck Garner. Cisneros also admitted to being in possession of a controlled substance earlier in the investigation. Cisneros will be sentenced on both charges May 21.