Franjo Mihalić ( ; March 9 , 1920 -- February 14 , 2015 ) was a Croatian-Serbian long-distance runner best known for his 1958 win at the Boston Marathon and his marathon silver medal in the 1956 Summer Olympics .
Franjo Mihalić ( ] ; March 9 , 1920 -- February 14 , 2015 ) was a Croatian Yugoslav long-distance runner . He was best known for his 1958 win at the Boston Marathon and his marathon silver medal in the 1956 Summer Olympics .