Gaeton Fonzi (October 10, 1935 – August 30, 2012) was an American investigative journalist and author known for his work on the assassination of John F. Kennedy. He was a reporter and editor for Philadelphia magazine from 1959 to 1972, and contributed to a range of other publications, including The New York Times and Penthouse. He was hired as a researcher in 1975 by the Church Committee and by the House of Representatives Select Committee on Assassinations in 1977, and in 1993 published a book on the subject, The Last Investigation, detailing his experiences as a Congressional researcher as well as his conclusions.