Sgt. Kevin Mercer of the Youngstown Police Department verified that Patrolman Michael T. Hartzell

Sgt. Kevin Mercer of the Youngstown Police Department verified that Patrolman Michael T. Hartzell was on d2uty, wearing his uniform and in a marked police car when he was shot about 2:19 a.m. April 29. Mercer was among the first police officers on the scene of Hartzell's shooting.
Julian Daatadeen, 24, of Boardman testified that he went to the Casaloma Gardens bar to pick up Donell Rowe and take him home around 12:30 a.m. April 29. He said Rowe had called him for a ride because he was too drunk to drive. Daatadeen said he saw Rowe argue with Koliser, then saw Koliser pull out a chrome-colored revolver and shoot Rowe in the chest.
Frank R. Howley of Youngstown said he traded cars with Koliser because he was afraid to refuse when Koliser insisted. Koliser's car was later found in Howley's garage. Howley, who didn't report the car switch to police until hours later, eventually pleaded guilty to obstructing justice and spent several months in prison.
David Lantz of Youngstown said Koliser came to his house shortly after Rowe was shot. Koliser told him he'd shot someone at the Casaloma bar on Mahoning Avenue. While at Lantz's house, Koliser asked for paper and a pen, and wrote letters to his father, son, mother and estranged wife before leaving.
Dr. John Thomas, a trauma surgeon at St. Elizabeth Health Center, said Rowe's injuries would have been fatal if they'd been left untreated. Thomas performed surgery on Rowe after the shooting.