The man who is serving a life sentence for killing a 16-year-old girl at least year’s Jerusalem gay pride parade was beaten up by fellow inmates during an argument over the murder.

Yishai Schlissel, a haredi Orthodox Jew, was hospitalized Wednesday after being assaulted by the two inmates at the Ayalon Prison.

Schlissel went on a stabbing spree at the annual march through Israel’s capital in the summer of 2015, killing Shira Banki and injuring six other marchers.

On Wednesday, Schlissel was treated for his injuries, which reportedly were light, at the Assaf Harofeh Medical Center outside Tel Aviv. Police opened an investigation into the incident.

According to the initial findings, Schlissel was allowed to go into a courtyard with the two prisoners, who are serving sentences for convictions related to organized crime. An argument broke out between Schlissel and the men regarding his murder of Banki. The two prisoners punched Schlissel in the face until guards separated them.

After a stabbing attack at the 2005 Jerusalem gay pride parade, Schlissel served 10 years in prison. Weeks after being released, and days ahead of the 2015 parade, he wrote an anti-gay diatribe calling the event “shameful” and “blasphemous” and alluding to plans to carry out another attack.

After his arrest, Schlissel refused legal counsel and said he did not recognize the legitimacy of the court as it does not abide by Jewish law. At his June sentencing hearing, Schlissel broke his silence in court for the first time, explaining that his crime was motivated by “love for God.” (JTA)