In the pre-dawn hours of a Saturday in March 2020, gunfire in the 100 block of South College Street in Warrensburg, Missouri, ended the life of 29-year-old Joseph B. Campbell. Officers arriving just before 4:30 a.m. found Campbell inside a residence with multiple gunshot wounds to the chest; he was pronounced dead at the scene. The investigation named 31-year-old Marvin Lewis Hill Jr. as a suspect after he turned himself in to the Warrensburg Police and was booked into the Johnson County Jail.

Authorities say a 3-year-old and an infant were allegedly in the room during the shooting, and Hill faced charges including second-degree murder, armed criminal action, unlawful use of a weapon, and first-degree endangering the welfare of a child. Multiple trials were held; one ended in mistrial for lack of jurors and another in a hung jury. A third trial in November 2023 resulted in guilty verdicts on those counts and a January 2024 sentence of 15 years in the Missouri Department of Corrections, with concurrent terms. An appeal was later filed and the Missouri Court of Appeals for the Western District affirmed the conviction in the summer of 2025.