Kennedy was born into a wealthy, political family in Brookline, Massachusetts. After serving in the U.S. Naval Reserve from 1944 to 1946, Kennedy returned to his studies at Harvard University, and later received his law degree from the University of Virginia. He began his career as a correspondent for ''The Boston Post'' and as a lawyer at the Justice Department, but later resigned to manage his brother John's successful campaign for the U.S. Senate in 1952. The following year, he worked as an assistant counsel to the Senate committee chaired by Senator Joseph McCarthy. He gained national attention as the chief counsel of the Senate Labor Rackets Committee from 1957 to 1959, where he publicly challenged Teamsters President Jimmy Hoffa over the union's corrupt practices. Kennedy resigned from the committee to conduct his brother's successful campaign in the 1960 presidential election. He was appointed United States attorney general at the age of 35, one of the youngest cabinet members in American history. He served as his brother's closest advisor until the latter's assassination in 1963.
In 1968, Kennedy became a leading candidate for the Democratic nomination for the presidency by appealing to poor, African American, Hispanic, Catholic, and young voters. His main challenger in the race was Senator Eugene McCarthy. Shortly after winning the California primary around midnight on June 5, 1968, Kennedy was shot by Sirhan Sirhan, a 24-year-old Palestinian, allegedly in retaliation for his support of Israel following the 1967 Six-Day War. Kennedy died 25 hours later. Sirhan was arrested, tried, and convicted, though Kennedy's assassination, like his brother's, continues to be the subject of widespread analysis and numerous conspiracy theories.