Aaron Hernandez was charged June 26 with the murder of Odin Lloyd. (Reuters)

The voice of Aaron Hernandez finally has been heard, in a letter he wrote to a fan from his Massachusetts jail cell.

TMZ Sports obtained a copy of the letter and, although it could not be authenticated, it was sent to a fan named Karl who was held at the Bristol County jail 15 years ago. Sheriff Thomas Hodgson told the Boston Herald that he couldn’t “say for certain” whether Hernandez wrote the letter but added, “I can confirm the envelope is authentic.”

Hernandez was arrested June 26 and charged with the murder of Odin Lloyd, a 27-year-old former semipro football player. Hernandez, who entered a not-guilty plea, is being held without bail and is confined to his cell 21 hours a day. “He’s been very ­polite, very respectful, no issues,” Hodgson told the Herald. “He’s not really doing anything other than writing and reading in his cell.”

In the letter, which he unsuccessfully begged “Karl” to keep off social media, Hernandez wrote: “I know everything happens for a reason and I know ‘God’ has a plan for me and something good will come out of this. The world just makes things out of false accusations and it will all die down, especially when they say not guilty and all the people that turned on me will feel like crap.”

Hernandez signed the letter with his number 81 — the number the New England Patriots have expunged since releasing him shortly after his arrest — and spoke of playing again.

“Can’t wait to sign [autographs] again when I’m playing again an [sic] prove all the haters and . . . talkers wrong!”

The letter surfaces on a week on which law-enforcement divers have been combing the bottom of a murky, muddy lake in Hernandez’s Bristol, Conn., hometown and presumably searching for the Glock that is believed to be the weapon that killed Lloyd.

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