Suicide – Violate Shabbos to Save attempted Suicide

Igros Moshe (OC I #127) Question: You are uncertain about the question of a whether Shabbos can be profaned to save the life of a person who caused the danger by attempting suicide. You cite the Magen Avraham that it is prohibited to profane Shabbos to save his life. Answer In my humble opinion it is impossible to say that because such a distinction is not to be found anywhere in the halachic sources. And there is an established principle that nothing stands in the way of saving life including Shabbos even if the danger was brought about by the person’s own actions. 

Igros Moshe (YD III #90) That which I wrote that one is obligated to even violate Shabbos to save life of one who attempted suicide – there is no question that that is correct and your questions from the Mishneh Berura and Rema are not relevant. The point is that one needs to do what he can to save the life of his fellow .