 Murro broke the national high school record in men's javelin throw in 1967 while attending Essex Catholic High School in Newark, New Jersey, throwing 252 ft 8 in (77.01 m).In June 1968 he placed third at the national championships; three months later he won at the United States Olympic trials with a throw of 263 ft 9 in (80.39 m), defeating national champion Frank Covelli and qualifying for the Olympic Games in Mexico City.Murro was the top American at the Olympics, throwing 80.08 m (262 ft  in) and placing ninth; "Track & Field News" ranked him as the world's 10th best javelin thrower that year.