ST. JOSEPH, Mich. – A Chicago doctor who devoted his career to saving the lives of children died trying to assist two young people who were struggling in the treacherous waves of Lake Michigan over the weekend.

Dr. Donald Liu, his wife and three children were enjoying a weekend getaway at a Berrien County beach Sunday when he spotted two children in the water who were struggling.

Liu, 50, was able to help the children to safety but was pulled under by a strong current and drowned, authorities and his friends told the Chicago Sun-Times.