Late NFL star-turned-killer Aaron Hernandez — who hanged himself in his jail cell after having been convicted of one murder but acquitted of two others — claimed ties to a fourth slaying, according to a former cellmate.

“[Hernandez] always used to tell me he had four murders,” Kyle Kennedy told journalist Dylan Howard for his book, “Aaron Hernandez’s Killing Fields,” an NBC Sports report said Thursday.

“He would just always, all the time joke around saying, ‘I got four bodies.'”

The longtime New England Patriots tight end was apparently referring to the slaying of Jordan Miller, according to Howard’s book.

Miller may have been murdered in a case of mistaken identity by a group of goons dispatched at Hernandez’s behest to kill semi-pro football player Odin Lloyd, the report said.

Miller and Lloyd reportedly had similar physical appearances, and ran in the same social circles.

The group eventually did catch up to Lloyd, who was shot dead about a week after Miller in a desolate industrial park near Hernandez’s Massachusetts home.

Detectives’ investigation of that 2013 slaying unraveled Hernandez’s double-life.

While being probed for that murder, Hernandez was implicated in the 2012 double slaying of Daniel de Abreu and Safiro Furtado over a spilled drink.

Hernandez was ultimately acquitted of the double-murder, but convicted of Lloyd’s killing and sentenced to life in prison.

In 2017, the former Pro Bowler hanged himself behind bars.