No it was not murder, it was Callous Indifference to Life
A distinction without a difference, when the people being callously indifferent are those charged as the legal guardian and custodian of the weak and helpless.
If you locked your dog in a closet, being callously indifferent to its need for water and food, and it died, you most certainly killed it.
Actually it was the wishes of Terri. I have no other data to go on except the word of her husband. Remember he brain was atrophied to the point of zero cognative capability including sight no matter what her parents claimed. This was not murder nor even callous disregard for life. I personally have a living will that shjould I end up in the same situation, I would be allowed to die.