- April 3 – 48-year-old Howard G. Kim uses a rifle to kill his 40-year-old wife Helen and sons John, 7, and David, 5, before committing suicide in the family home at 4012 Mapleton Drive in Chantilly.
- April 18 – 22-year-old Sandra D. Niccum and 38-year-old Donna P. Tehan are beaten to death by John C. Marteny at their home at 2619 Glengyle Drive in Vienna. Their bodies are discovered late the next day by Fairfax County Police.
- April 26 – 22-year-old Glen Darby is killed and his 21-year-old brother Gary is injured when a seven-foot deep trench collapses on the construction site of the Terra Grande development in Springfield. Darby is taken to Fairfax Hospital, where he is pronounced dead on arrival.
- Latimer, Leah Y., and Mary Battiata. "Couple, Two Sons found Shot to Death in Fairfax." The Washington Post (1974-Current file): 2. Apr 05 1984. ProQuest. Web. 16 Aug. 2016.
- Battiata, Mary. "Korean's Futile Search for Self-Esteem Destroys Family, Life Built in U.S." The Washington Post (1974-Current file): 2. Apr 30 1984. ProQuest. Web. 16 Aug. 2016.
- "Fairfax Women were Killed by Head Blows, Police Say." The Washington Post (1974-Current file): B5. ProQuest Historical Newspapers: The Washington Post (1877-1995). Apr 22 1984. Web. 2 June 2012.
- Fishman, Charles. "Falls Church Man Convicted of Murdering 2 Women." The Washington Post (1974-Current file): 1. Sep 27 1984. ProQuest. Web. 14 Apr. 2017.
- Fishman, Charles. "Virginia Man Dies, 15 Injured in Four Area Work-Site Accidents." The Washington Post (1974-Current file), Apr 27 1984, p. 1. ProQuest. Web. 25 Aug. 2018. Note: This report incorrectly gives Glen Darby's age as 26.
|Fairfax County by Year: 1984|
|March 1984||·||April||·||May 1984|