The officer shot Blake seven times in the back while responding to a domestic incident in August.
Lebron James, who's been vocal on police shootings, spoke after Tuesday night's game against the Grizzlies.
"It's a blow to our community once again. We've been here before. It sucks. We feel sorry for this family and that community itself. We want better, and hopefully we can get that," he said.
The Wisconsin prosecutor said he didn't think he could prove the officer and others there were acting in self-defense.
Blake survived the shooting but was paralyzed from the waist down.
No charges against Kenosha officer who shot Jacob Blake
No charges against Wisconsin officer who shot Jacob Blake