On April 15, 2023, 20-year-old Kaylin Gillis was murdered in Hebron, New York, after the car she was traveling in turned into the wrong driveway.

Their car and another vehicle mistakenly pulled into the driveway of Kevin D. Monahan, who lived on a ridgetop plot in the rural town of Hebron, on Patterson Hill Road.

[9] Unable to get cell phone reception in Hebron, the group drove toward the neighboring town of Salem, where they were able to reach 9-1-1.

[9] According to papers filed in Washington County Court, Monahan had initially claimed to police that he had been "in bed since 8:30 p.m." and suggested that hunters had been responsible for the killing.

He was denied bail at a hearing the next day, with the prosecuting attorney saying that Monahan's reputation as "confrontational and hot-tempered", in addition to the seriousness of the crime, weighed in favor of pretrial detention.

[6][8][13] A new indictment was issued in May 2023; in addition to second-degree murder, he also faced charges of reckless endangerment and tampering with evidence.

On October 25, the presiding judge granted a defense request for additional time to seek expert analysis of certain evidence.