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Black Lives Matter activist MarShawn McCarrel killed himself Monday night on the steps of the Ohio Statehouse in Columbus, according to authorities.

(Courtesy of Facebook)

COLUMBUS, Ohio -- A Black Lives Matter activist killed himself on the steps of the Ohio Statehouse Monday night, authorities said.

MarShawn McCarrel, 23, of Franklin Township, a Columbus suburb, shot himself in front of the Statehouse Monday evening, Lt. Craig Cvetan of the State Highway Patrol told the Columbus Dispatch.

Cvetan told The Associated Press it's unclear why McCarrel killed himself. Authorities say nobody saw the shooting, but McCarrel was seen on Statehouse grounds just before the gunshot. He was pronounced dead at the scene.

"My demons won today. I'm sorry," the activist posted on his Facebook page about 3 p.m. Monday, just hours before his body was found near the Statehouse.

His last tweet read: "Let the record show that I pissed on the state house before I left."

McCarrel, who had recently worked with Black Lives Matter, helped organize protests in Ohio after a Missouri cop shot and killed unarmed black teenager Michael Brown in 2014, The New York Daily News reported.

He also founded youth mentorship program Pursuing Our Dreams, which launched Feed the Streets, a project to help Ohio's homeless. He attended the NAACP's Image Awards on Friday, Pursuing Our Dreams wrote on its Facebook page.

McCarrel was a committed activist for various movements, entertainment website Heavy.com reported. Referencing the Staten Island man who was choked to death by NYPD officers in the summer of 2014, McCarrel said in 2014, "People who look like me are one breath away from being an Eric Garner."