In the United States a warrant is sufficient for a compulsory blood test to check blood alcohol levels. If we accept that proving guilt in court is an appropriate reason to violate bodily autonomy than so too would saving the life of someone who's been endangered by your actions.
Morally however, I also do think it's wrong to not give the blood transfusion because the burden is small and the cost of not doing so is large. Whether it rises to the level of murder is a tougher question that I think would depend on intent.
Do you think a suicidal pilot has the right to stop flying a plane mid-flight even if she knows that no one else on the plane will be capable of landing it?