Is self-immolation murder?
Human life is very rare and precious. Also when doing this the chances are that your last thought will not be good leading to rebirth in a lower relm. So in my opinion and general consensus in my tradition is that this should not be done. Also in doing this the following conditions of killing is met:


You know that yourself is a living being
You device a method to for self immolate
You follow through with the intention
As a result you die