Aaron Hernandez attacked a fellow inmate at Bristol County Jail on Tuesday, TMZ reported, citing sources.

The former New England Patriots tight end, who’s typically relegated to solitary confinement, was walking in an isolated hallway, according to TMZ, when he somehow came into contact with another inmate. Sources told TMZ that Hernandez recognized the other man, went after him and “beat the guy up pretty good.” A source also said the inmate had been harassing Hernandez “nonstop” all day.

Hernandez has been locked up since June 26 in connection with the alleged murder of Odin Lloyd.