Unhinged Patriots fans are menacing the football writer who exposed Antonio Brown’s second accuser — telling the man to ‘watch his back’ in chilling messages while apparently sharing his home address, he claimed Saturday.

Robert Klemko — a reporter for Sports Illustrated — published screenshots of the racist and intimidating messages on his Twitter account after the Patriots dumped Brown on Friday when two women accused him of sexual harassment.

Angry Patriots fans appeared to share Klemko’s address and phone number in the screenshots, one man telling the journalist: “I hope you get in a car accident.”

A second woman accused the wide receiver of sexual misconduct in a bombshell report written by Klemko last week — saying the footballer inappropriately propositioned her at his Pittsburgh home in 2017.

“Luckily these Patriots fans are being really chill and cool about this,” Klemko wrote sardonically while sharing the slew of abuse on his Twitter Saturday night.

“Your source is a lying c–t I hope you both die slow painful deaths,” one alarming tweet directed at Klemko reads.

In a separate private message, another Brown fan warns Klemko: “Watch ur [sic] back negro.”

One user known only as “Josh” also abused Klemko — telling him: “U [sic] ruined my fantasy team u [sic] stupid f–k u [sic] owe my 500 dolla pot fee.”

“You’re betting way too much on fantasy,” the journalist responded mockingly.

Brown was sacked by the Patriots on Friday after playing just one game.

Owner Robert Kraft was “enraged” when he learned Brown had sent threatening messages to the accuser Klemko interviewed, according to a report.