I want to thank all of you who offered your condolences as well as your input.
Fasting may or may not have been a contributing factor, if only indirectly, but what I have learned is that he had fallen down at home and suffered a femur fracture. He was taken to the hospital where he underwent surgery to repair the fracture. He never recovered and was never again ambulatory and continued to decline. One week after the surgery, he was sent to Hospice for end-stage Parkinson's and died five days later.