DENVER (CBS4)– An inmate will be disciplined after he allegedly assaulted the Aurora theater gunman in prison.

Mark Daniels will be charged with assault after he allegedly assaulted James Holmes and a correctional officer. The charges will be addressed internally with a hearing inside the prison.

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The assault allegedly happened at the Colorado State Penitentiary on Oct. 8. Apparently Daniels lunged at Holmes and took a few swings at him when inmates were passing each other in a hallway.

James Holmes in court on Aug. 24, 2015 (credit: CBS)

James Holmes in court on Aug. 24, 2015 (credit: CBS)

Holmes is confined to a control unit where he is allowed to spend four hours in a day hall. There are no other inmates in his cell block.

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Holmes was not injured and was returned to his unit. It is unclear whether the corrections officer was injured.

Holmes was sent to the Colorado State Penitentiary in September after he was convicted in the Aurora theater shooting where he killed 12 people and left 70 others injured.

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Daniels is serving time for numerous convictions for menacing and theft.