- September 10 – A Fairfax Circuit Court jury convicts 24-year-old George A. Poole, Jr. of robbery and murder for the rip-off that resulted in the murder of Donald S. Monsky in Great Falls on November 16, 1974. Judge Percy Thornton sentences Poole to 25 years in prison.
- September 25 – 26-year-old Donald R. Brown pleads guilty to first-degree murder for fatally shooting his estranged wife Karen as she arrived for work as a receptionist in a Reston dentist's office on January 13.
- Seaberry, Jane. "Man Given 25 Years in Great Falls Killing." The Washington Post (1974-Current file): 1. Sep 11 1975. ProQuest.Web. 8 Sep. 2016 .
- Kast, Sheilah. "Wife Killer Free on $10,000 Bond."Evening Star, 28 Sep. 1975, Four Star SUNDAY, p. 24. NewsBank. Accessed 3 Jan. 2018.
|Fairfax County by Year: 1975|
|August 1975||·||September||·||October 1975|