"The prostate cancer finished toying with me on October 6, 2017. I was 66 and glad to be done with the damn disease," Mr Mooney wrote.
Surprisingly, his one lament was wishing he had been able to do more work as a journalist.
"I wish I had done more work as a news reporter. Written better stories. Made more and better contacts. Skipped some of the easier pieces and done more in-depth stories. Spent more time on foreign stories. Been a better editor," he wrote.
"I loved being a reporter... It's where I met most of my best friends. It's where I met my wife Barbara," he added.
Mr Mooney's final wish: "In lieu of flowers, donate to a favorite cause."
Read Mr Mooney's entire post here:
I just published "My Last Byline" https://t.co/9WWuiGiDbi— Mark Mooney (@mxmooney) October 6, 2017
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