A man who pleaded guilty to an armed robbery in LaGrange was sentenced to an extra 10 years in prison after investigators discovered he had attempted to influence a witness, prosecutors said Wednesday.

Dwon Harris was set to face trial in connection with the February 2017 armed robbery, according to a statement from District Attorney John Cranford Jr.’s office in the Coweta Judicial Circuit.

Harris was accused of pointing a gun at a man and stealing $40 from him, while the victim’s 4-year-old daughter stood nearby.

He was offered a plea deal of 20 years in prison followed by 10 years on probation, but his case was still set to go to trial, the DA’s office said.

The night before his trial was scheduled to begin, prosecutors found evidence that Harris tried to find people who could “intimidate” the victim and stop him from testifying, the statement said.

As a result, an assistant district attorney added 10 years to the plea recommendation, and Harris accepted it. He is now set to serve 30 years in prison and 10 on probation.

“Witness tampering is a serious crime that endangers the safety of our victims and our community,” the DA’s office said.

Harris pleaded guilty to armed robbery, possession of a gun during the commission of a felony and possession of a gun by a convicted felon.

The DA’s office said Harris lured a 36-year-old father out of an apartment on Feb. 11, 2017, in LaGrange and pointed a gun at his head while threatening to kill him.

Though Harris was wearing a red bandanna over his mouth, the victim knew him and was able to identify him. The incident was also captured on surveillance video.

Davaris Lindsey, a co-defendant who stood behind Harris during the armed robbery, also pleaded guilty and was sentenced to 10 years in prison and 10 on probation.

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