Our expert says:
If your dad had a septic infection, the most probable cause of death is septiceamia (sepsis spread by the blood to all the organs) He could have developed this whether they operated or not, and the risk when not operating would have been greater. You are right, the foot may have developed gangrene and spread up the leg if they left it. Your tongue going white is not an indication of death - this can happen when you are very anemic or your blood pressure is very low. Death is usually diagnosed when there is no more breathing and heart/brain activity.
Please tell your mom not to blame herself, under the circumstances, with the information she had, she made the best decision she could have.
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