Updated

Aaron Hernandez may have murdered a former pal to protect his most guarded secret — that he was bisexual, a new report says.

The muscle-bound former New England Patriots tight end allegedly had a longtime male lover, a friend from high school, and left behind a suicide note this week addressed to a gay jailhouse lover, Newsweek said.

The suicide note was one of three found in Hernandez’s cell after he hanged himself Wednesday — the other two were to his fiancée and to his 4-year-old daughter.

AARON HERNANDEZ LEFT NOTES TO DAUGHTER, GIRLFRIEND, REPORT SAYS

Hernandez, 27, had been serving life without parole in a Massachusetts prison for the 2013 shooting murder of his former pal, semi-pro football player Odin Lloyd, a slaying that ended Hernandez’s promising career less than a year into a $40 million contract extension.

Why Hernandez threw everything away to leave his friend riddled with six bullets in the gravel of a suburban Boston industrial park has remained a mystery, even after an extensive 2015 trial.

Cops long believed that Lloyd had incriminating information on Hernandez that the player didn’t want to get out.

Click for more from New York Post.