- Was shot with a 35 caliber lever action Marlin 336C rifle by his older brother, Ronald DeFeo. Marc and his brother, John are fired at close range (less than 2 inches). The bullets penetrated the heart, lungs, diaphragm and liver of each victim. The spinal cord of John is severely affected.
- Grandson of Rocco DeFeo, Antoinette "Nettie" DeFeo, Michael Brigante, Sr. and Angelina M. Brigante.
- Son of Ronald, Sr., and Louise DeFeo.
- Ex-brother-in-law of Barbara Puco, Tracey Defeo and Nissa Burkhalter.
- His father's uncle was Pete DeFeo, a caporegime in the Genovese crime family.
- Marc Gregory DeFeo (12) b. September 4th, 1962 in Brooklyn, N.Y. (King's County) both tragically lost their lives during the early hours of November 13th, 1974 along with their parents Ronald Sr. (43) Louise (42) and their sisters Dawn (18) and Allison (13).
- He went to Saint Martin of Tours.
- Attended St. Martin of Tours Church at 35 Union Ave. in Amityville.
- Grandnephew of Peter DeFeo.
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