MarShawn McCarrel, 23, was pronounced dead at the scene after police responded to reports of a shooting near the front door of the Statehouse around 6 p.m. local time on Monday. Police told the Columbus Dispatch there were no witnesses.
He also posted photos of himself attending the NAACP Image Awards with his mother on Friday.
McCarrel was involved in organizing protests in Ohio after the fatal shooting of unarmed black teenager Michael Brown by a white police officer in Ferguson, Missouri.
After being homeless for more than three months following his high school graduation, McCarrell founded Pursuing Our Dreams, a community group that launched a project to feed Columbus' homeless population.
“We don’t believe in heroes. We believe in neighbors," he told Columbus Underground about the group's mission.
McCarrel's Facebook page was awash in memorial posts Tuesday, with dozens of posts testifying to the lives he touched.