Need to understand options relating to apparent negligence on the part of veterinarian resulting in the death of our beloved 13 year old cat.

Pet was being seen for problems with intermittent vomiting, reduced appetite, and concern over possible bowel obstruction. Physical exam was competed at local office and was inconclusive. Vet wanted to do more testing at his main facility to rule out issues with liver function via lab test and ultrasound. We took our pet to the main office. Out cat was put on an IV to improve hydration and allow for the administration of a sedative to more easily perform liver biopsies. The death occurred during post biopsy period during the insertion of a feeding tube. Cause of death was cardiac arrest. It is our belief, that a failure to maintain an adequate airway and supportive ventilation is at minimum the cause of death. We were devastated and I have been inconsolable. Much more information will be made available if requested. Date of incident was 01/06/17