Aaron Hernandez may be in jail while authorities investigate his role in the alleged murder of Odin Lloyd, but the former New England Patriots star remains emphatic about his innocence. In a letter to a fan identified only as “Karl,” Hernandez declared he is “not guilty,” provoking a strong reaction on Twitter.

The prison letter, originally obtained by TMZ, is the public’s first glimpse into the current mindset of the incarcerated football star. In the letter, Hernandez decried the prosecution’s “false accusations” regarding the alleged murder, claiming that the charges “will all die down, especially when they say ‘Not Guilty.’”

“I know everything happens for a reason and I know 'God' has a plan for me and something good will come out of this,” Hernandez wrote in the prison letter. “I’ve always been a great person an [sic] known for having an amazing heart!”

Hernandez, 23, also admitted that he was “humbled” by his current situation. “I fell off especially after making all that money but when it's all said and done “God” put me in the situation for a reason!” he wrote.

Hernandez finished off the jail letter by asking “Karl” to “keep [the letter] off social media please!” Ironically, Karl did the exact opposite, causing an outcry from Twitter users, who criticized Hernandez’s declarations of innocence and flippant references to God.

“Aaron Hernandez’s prison letter just makes him look even more guilty. Staged, phony, and WRITTEN IN THE BLOOD OF HIS VICTIMS,” wrote one Twitter user. “Aaron Hernandez is delusional and clueless. This guy wrote a letter proclaiming his innocence as he claims God has a plan for him,” another person tweeted. “Aaron Hernandez is an idiot for that letter!! My dude GOD didn’t put you in this situation!! I believe God said “Thou shall not kill”! [sic],” a third person wrote.

Hernandez was arrested on June 26 after authorities linked him to the death of Lloyd, a known associate and semi-pro football player. Despite the prison letter’s claims of innocence, it will be several months before the former Patriots player will get a chance to defend himself from pending murder and gun charges. The 23-year-old is currently being held without bail.