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Trayvon Martin's killer George Zimmerman has been charged with stalking.

Zimmerman faces accusations he sent harassing and threatening messages to a private investigator Dennis Warren.

African American Trayvon was just 17 when he was shot dead by neighbourhood watch volunteer Zimmerman, back in 2012.

He was later found not guilty of second-degree murder and acquitted of manslaughter.

Lawyers for Zimmerman argued he acted in self-defence and with justifiable use of deadly force.

Today a court in Florida has issued a summons against 34-year-old Zimmerman for alleged stalking.

It claims Zimmerman "did wilfully, maliciously and repeatedly follow, harass or cyberstalk, another person".

It says the crime took place between December 16 and December 25, last year.

Zimmerman's arraignment is scheduled for Wednesday, May 30, when he is expected to enter a plea.

According to reports in the US the accusations surround Mr Warren's work on a documentary called Rest in Power: The Trayvon Martin Story.

Zimmerman allegedly sent the documentary's producer Mike Gasparro a message saying: "Help (the investigator's wife) out and give him a heads up.

"I'm going to find him. And I'm bringing hell with me."

Over 10 days in December the investigator allegedly received 55 phone calls, 67 texts, 36 voicemails, and 27 emails from accounts associated with Zimmerman.

Following Zimmerman's murder acquittal he was accused of provocative behaviour towards those campaigning for "justice" following Martin's death.

Back in 2015, Zimmerman had a Twitter meltdown, which started when he appeared to boast about killing the black teenager.

He retweeted an admirer's post showing the boy's Martin's lifeless body, which was used in evidence at his murder trial.

The fan described Zimmerman as a "one man army" in the tweet, which was shared with the former neighbourhood watch guard's 11,000 followers.

(Image: REUTERS)

He refused to remove the graphic image, which was taken down days later by Twitter.

In 2016, he tried to sell the 'iconic' gun he used to shoot young Martin.

The sale listing, written by Zimmerman, says he is "honoured and humbled" to announce the sale of the "American Firearm Icon".

He claims the gun was used "to defend my life and end the brutal attack from Trayvon Martin".

(Image: Reuters) (Image: REUTERS)

Zimmerman adds that the gun is "fully functional" and claims the firearm auction is "your opportunity to own a piece of American history."

He signs off by selling potential buyers: "Good luck."

Since putting the gun up for auction, Zimmerman claims he has received death threats.

The firearms selling website, GunBroker.com removed Zimmerman’s lot from their website.