"I honestly can’t believe I’m making this post right now...I’m so hurt...nothing feels real," Darnella Frazier, 18, wrote in a Facebook post, adding that police "took an innocent life trying to catch someone else."
The teen identified the victim as Leneal Lamont Frazier.
Minneapolis police said in a statement that an officer was pursing the driver of a carjacked vehicle involved in multiple robberies when the officer's car collided with another car.
The officer was treated for serious but non-life-threatening injuries, and the other driver died shortly after arriving at the hospital, police said. Police have not yet released the identity of the man who was killed.
The Minnesota State Patrol will conduct an investigation into the crash, according to the police statement.
Frazier, then 17, went to a Minneapolis convenience store in May 2020 when she spotted officers restraining Floyd. She filmed the incident and her video and courtroom testimony played a role in the conviction of a former police officer, Derek Chauvin.
She was awarded a Pulitzer Prize special citation last month for her video.