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In the video, at the far end of the table is the one white man in the group, identified by Sanders’ friends as Dylann Storm Roof, the alleged shooter.

Sanders, 26, graduated last year from Allen University, where he studied business. In a news release, the school described Sanders as "a quiet, well-known student" with "a warm and helpful spirit."

On his Instagram account, Sanders called himself a poet, artist and businessman. His photos were filled with friends, smiles, family members and motivational quotes.

Hours before the shooting, he put up his final post, a meme with a quote from Jackie Robinson. It read: "A life is not important except in the impact it has on other lives."

The Associated Press contributed to this report.