A state police trooper was sitting in his car in Downtown Indianapolis when a man ran toward him shouting.

“There is a man over there beating and kicking a woman!”

The witness then pointed to the area in Monument Circle and described the suspect: a man in a bright green shirt, according to court documents. “This man is crazy, he was also trying to fight me," the witness told ISP Capitol Police Section Cpl David Poynter.

The man, identified as Jonathan Belcher, went on a violent and apparently random rampage at the Indiana Soldiers and Sailors Monument that October 2017 night, injuring three people. One of the victims died months later, authorities say.

Belcher, 34, was sentenced this week to 53 and a half years in prison in connection with the assaults, Marion County Prosecutor Terry Curry announced Friday. Belcher was found guilty but mentally ill of charges of aggravated battery, battery and resisting law enforcement last month. He was also convicted of being a habitual offender, the release said.

The habitual offender conviction added 20 years to his sentence. The guilty-but-mentally-ill conviction means Belcher will receive mental health treatment during his time at the Indiana Department of Correction.

Belcher's attorney declined to comment on the case to IndyStar.

Prosecutors say Belcher assaulted three people in the area of Monument Circle on the night of Oct. 19, 2017. The first person he attacked was standing on the northeast side of the Indiana Soldiers and Sailors Monument when she heard Belcher ask her what she was doing there. Belcher then hit her in the face and kicked her repeatedly while she was on the ground, the release said.

The second victim, David Smith, was walking near the monument when Belcher hit him in the face, causing Smith to fall and hit his head on the concrete pavement, prosecutors said. Belcher also struck Smith's friend.

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A crowd of bystanders had gathered when Poynter and the witness approached the area, according to a probable cause affidavit. Per the document they yelled,"that’s him, that’s him in the bright green shirt! Going right there!"

Poynter then saw the female victim laying against a wall and bleeding from her face. Bystanders were helping her.

Poynter began chasing Belcher, he wrote in the affidavit. The suspect kept shouting, "this is my ship!" He refused to follow police orders to get on the ground, according to the affidavit.

Multiple officers were at the scene by then. Another trooper deployed his stun gun, striking Belcher in the back, Poynter wrote in the affidavit. Belcher was taken into custody.

The injured woman was taken to a hospital with facial trauma. Smith suffered severe brain trauma. He died in May 2018 as a result of his injuries.

Contact IndyStar reporter Crystal Hill at 317-444-6094 or cnhill@gannett.com. Follow her on Twitter: @crysnhill.