Nyro was inspired to write the song after the June 5, 1968 assassination of Robert Kennedy. The most successful version was performed by The 5th Dimension. It reached #10 on the U.S. adult contemporary chart, #24 in Canada, #27 on the Billboard Hot 100, and #79 in Australia in 1970. It was featured on their 1970 album Portrait. The song was produced by Bones Howe and arranged by Bill Holman, Bob Alcivar, and Howe.