I disagree with all forms of euthanasia. And I make no difference between a lethal injection and omitting a treatment. It's suicide! However if a traetment is ommitted just because that treatment causes pain, not with the purpose of letting the person die, it's wrong but not just euthanasia.
However if the person has written a will and wishes euthanasia, we can't force him to accept Hallacha. There's religious freedom!!!!