Kenneth Day

Kenneth Earl Day has been identified as the lead suspect in a murder and a series of rapes in Rockville, Maryland in the late 1980s and early 1990s. The case has been cleared by exception due to the death of Day.

On June 25, 1989, a 53-year-old woman was abducted and raped as she left the Twinbrook metro station. There were reports that other women had been attacked while walking alone in that area.

On October 3, 1994, 44-year-old Le Bich-Thuy, a research scientist working at the Children’s National Medical Center, was murdered by an unknown assailant in that same area. She got out at the Twinbrook metro station when she was grabbed and dragged into a side yard. She was raped and bludgeoned with a piece of concrete and then strangled to death. DNA profiles from the two assaults linked the crimes together, but there were no hits in law enforcement databases.

The FGG investigation was conducted by Parabon Nanolabs, who had produced a forensic phenotype of the suspect in 2017. Day’s DNA was confirmed to be consistent with the crime scene DNA using a sample that had been taken at his autopsy. He died in 2017 at the age of 52.


Shapiro, Emily. “Suspect in Decades-Old Murder, Rape Cold Cases in Maryland Identified Through DNA: Police.” ABC News, March 18, 2019. Accessed December 13, 2020.

Moore, Anna. “Maryland Police Say Former W.Va. Resident Identified as Suspect in Cold Case.” WCHS Eyewitness News, March 21, 2019. Accessed December 13, 2020.

Morse, Dan. “A Research Biologist Was Raped and Killed 24 Years Ago. Police Say Attacker May Have Looked Like This.” Washington Post, July 9, 2018. Accessed December 13, 2020.


First Name Kenneth
Last Name Day
Other Names
Victims 2 (Details)
IGG Started nd
Case Cleared 2019-03-15
IGG Org Parabon


Case ID Name Age Case Opened Location Investigating Org Most Serious Charge Disposition Court
1181 n/a Jane Doe 52 1989-06-25 Rockville, MD Montgomery CPD All sexual offenses, including rape, sexual assault, and child molestation Case was cleared by exception due to death of perpetrator n/a
1180 Le Bich-Thuy 44 1994-10-03 Rockville, MD Montgomery CPD Second degree murder Case was cleared by exception due to death of perpetrator n/a

Last updated: February 9, 2024

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Case data and narrative licensed under CC BY 4.0: Dowdeswell, Tracey (2023), “Forensic Genetic Genealogy Project v. 2022”, Mendeley Data, V1, doi: 10.17632/jcycgvhm96.1. All other content, including photos, have been added.