The man accused of harassing a pair of Muslim teen girls on a train and then stabbing three men who asked him to stop has now been accused of assaulting a black man while in jail, reports The Oregonian.

Jeremy Christian is facing murder charges from the May 2017 confrontation, which began with him verbally harassing two Muslim girls who were headed home from school. Three white men acted as Good Samaritans and tried to stop the abuse, leading to a confrontation that culminated with Christian stabbing three people, two of whom were killed.

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Christian’s attorneys have said he was pushed by one of the men he stabbed—Christian pled “not guilty of anything but defending myself against violent aggression by [alleged victim] Micah Fletcher”—and both prosecutors and the transit agency that operates the trains still refuse to release the video of the run-up to the confrontation.

Christian now faces a fourth-degree assault charge, in which he allegedly “intentionally, knowingly or recklessly cause[d] physical harm” to an inmate named Aundre Dupree Mills who was held on a probation violation. The incident happened on July 29 at Multnomah County jail.

In the weeks before the MAX stabbings, Christian attended an alt-right rally in Portland where he was videotaped making racist comments and making a Nazi salute.