Antony Ferrill, the man accused of killing five co-workers and himself at a Molson Coors plant, reportedly had a long-running dispute with the co-worker .

The New York Post reported that Ferrill had frequently gotten into arguments with one of the victims he killed, a fellow electrician, according to an account that an employee related to the Milwaukee Journal Sentinel.

The two co-workers had been accusing each other of going into each other’s’ offices and messing with computer equipment or swiping tools, according to a source, who did not want to be named.

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The source also noted that Ferrill frequently watched movies on his phone throughout the day, which other co-workers complained about, and Ferrill believed he was being discriminated against because he was black.

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