Two Colorado paramedics were convicted of criminally negligent homicide in the 2019 death of Elijah McClain, a young unarmed Black man whose case drew national attention and forced public safety reforms in the city where he lived and died.

But the mostly white jury split on two assault charges against the paramedics, Peter Cichuniec and Jeremy Cooper, after two days of deliberations. They convicted Mr. Cichuniec of one of the assault charges, second-degree assault for the unlawful administration of drugs, but cleared Mr. Cooper of both assault charges.

The men had injected Mr. McClain with the powerful sedative ketamine while he was in police custody in Aurora, Colo., which doctors said left him near death. He died days later in the hospital.

The nearly four-week trial was a rare prosecution of paramedics, and raised the question of the role that medical personnel play in police encounters and whether they could be held criminally responsible for their actions.