The reason for the argument between the men, as well as the precise sequence of events, was still the subject of investigation late Tuesday. Why the maintenance employee was shot was unclear.
Both men involved in the altercation were listed as "persons of interest." In a statement, the Harris County Sheriff's Department said one had a student ID and that both remain under armed guard at the hospitals where they are being treated.
Later Tuesday, sheriff's officials identified the accused gunman as Carlton Berry, 22.
Although he remains hospitalized for an apparently self-inflicted accidental gunshot wound, Berry has been charged with aggravated assault.
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