Christopher Sign, 45, was found dead in his home in Hoover, just outside Birmingham, on Saturday.
Police are investigating the father-of-three's death as a suicide but have not released any further information as of now.
Sign was the first to report on President Clinton's meeting with Lynch back in 2016 on her private jet at Phoenix airport amid the ongoing investigation into whether Hillary Clinton's use of a private email server while Secretary of State was illegal.
Days after the meeting, the FBI chose not to bring criminal charges against Hillary.
Back in February of last year, Sign revealed in an interview with Fox News that he and his family had received death threats and his credit cards were hacked in the aftermath.
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'My family received significant death threats shortly after breaking this story,' Sign revealed in the interview promoting his book, titled 'Secret on the Tarmac', about the meeting.
Sign said he and his wife Laura had prepared their three young children in case something happened by giving them 'secret code words', adding that 'they know what to do'.
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'That's why I came back to... Birmingham because when I was enduring the death threats it was my former Alabama football family - my teammates, my coaches - who circled around me.'
The story that led to the death threats had alleged that Clinton and Lynch met on her private jet to speak about the email investigation into Hillary amid the 2016 election campaign. Clinton and Lynch maintained that it was only an impromptu friendly chat.
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Former President Trump tweeted at the time his story broke: 'Does anybody really believe that Bill Clinton and the U.S.A.G. talked only about 'grandkids' and golf for 37 minutes in plane on tarmac?'
After news of the meeting began circulating, Lynch was required to outline what happened to then Justice Department Inspector Michael Horowitz and to lawmakers behind closed doors on Capitol Hill.
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'As we walked to the door, the head of my security detail came to me and said: 'Ma'am, I've been informed … that former President Clinton is also at the airfield and would like to say hello.'' Lynch testified.
She said Clinton 'spoke with him for several minutes, asked about our trip, asked about our flight.'
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She was questioned about whether she felt that the conversation was going on too long and conceded, 'As we were leaving I felt that it was - it certainly was going to raise a potential issue in the appearance of how the case was being handled.'
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The FBI chose not to bring criminal charges against Hillary at the time but the probe was reopened less than two weeks before the election when emails were found on a laptop belonging to top Clinton aide Huma Abedin's husband Anthony Weiner.
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