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The videos subsequently were used as evidence during Mr. Mehserle’s murder trial and posted online, further stoking the racial tensions brought on by the shooting.

Facing a second-degree murder charge and a maximum 14 years in prison, Mr. Mehserle tearfully testified at his trial that he meant to use his stun gun instead of his .40-caliber pistol.

Jurors found that while Mr. Mehserle didn’t mean to kill Mr. Grant, his behavior was so negligent that it was criminal.