On the night of April 20, 2015, 25-year-old Randall Radtke was shot in the head during a violent argument while inside a car traveling on Interstate 894 in Milwaukee. Radtke’s body was later found dumped outside a house in the 800 block of W. Hayes Ave. on the city’s south side shortly before 11 p.m., and he was pronounced dead at the scene.

Investigators identified two acquaintances as suspects. Court filings name Andrew M. Scholz, 30, as the shooter and Claytin E. Krimmer, 32, as the driver. According to Krimmer’s account to detectives, Scholz — also known as Ghost — held a gun to Radtke’s head and fired while seated behind him; Krimmer said both men appeared under the influence. Krimmer told police they pulled off the freeway afterward and pushed Radtke’s body out of the car, and Krimmer’s girlfriend reported seeing blood on Scholz’s clothing and shoes when they arrived at her house later that night.

What details about Radtke’s movements that evening might help explain how the argument escalated?