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The St. Louis Circuit Attorney’s Office has filed charges against five people in connection with a conspiracy to kill key witnesses for a woman’s son on trial for murder, KTLA sister station KTVI reported.

A St. Louis teen is accused of murder, and his mother is accused of having two witnesses killed to keep her son out of jail. This started with the murder of a 16-year-old almost three years ago. Police arrested a suspect, but prosecutors dropped the charges last year.

"We had a mom who wanted to make sure her son did not go to jail, wasn't found guilty of his murder charges," said Assistant Circuit Attorney Beth Orwick. "So, she started this plan. That's what set it off. She used relatives and other people that she knew to make sure that they were quieted."

In September 2013, Chauncey Brown, 16, was gunned down near Club 187 in north St. Louis. Homicide detectives with the St. Louis Metropolitan Police Department believed Brown, a student at Sumner High School, was killed over a long-standing feud.

During the course of their investigation, detectives learned Brown was outside the club—which was hosting a teen party—with a friend, identified as James Moore. A white Dodge Charger chased the two teens into a nearby alley and several shots were fired from the vehicle. Brown’s body was found the next day.

Police arrested Tyrell Davidson, now 19, in connection with the murder and several eyewitnesses had given statements to police. In November 2013, Davidson was charged on suspicion of homicide, assault, two counts of armed criminal action, and shooting from a motor vehicle. He was jailed pending a trial.

Less than a month after Brown’s murder, Moore was gunned down in a park. Moore was waiting at the bus stop with his brother on the morning of October 22, 2013 when a silver Charger pulled up and the driver pointed a handgun at the two siblings. Moore and his brother went running through the park, but the driver only chased after Moore.

He was shot several times, collapsed in died in a baseball field in the park.

In April 2014, another witness, identified as Noah Barnes, was killed. Prosecutors said Barnes was inside the Dodge Charger with Davidson when Davidson killed Chauncey Brown. Barnes’ body was found lying in the street in the 1900 block of Clara Avenue on April 22. He’d been shot in the head, torso, and extremities.

Other witnesses in the case were no longer willing to testify in court against Davidson, and prosecutors eventually had to drop the charges, The St. Louis Post-Dispatch reported. He was released on October 26, 2015.

According to prosecutors, further investigation revealed Tyrell Davidson’s mother, Latasha Mopkins, asked relatives, identified as Frederick Mopkins and Cortez McClinton, to kill essential witnesses to ensure her son’s release. Frederick Mopkins is accused of enlisting the help of Travon Knighten in the killing of Moore.

Knighten, McClinton, and Frederick Mopkins have lengthy criminal histories, prosecutors said.

On July 1, Knighten received a suspended execution of sentence for first-degree tampering, first-degree child endangerment, resisting arrest, possession of a controlled substance, and unlawful use of a weapon.

McClinton has previously served time for first-degree tampering and marijuana possession; he’s pleaded guilty on 12 separate occasions to driving with a revoked license; and he was charged with second-degree murder and armed criminal action in May 2016.

Frederick Mopkins pleaded guilty to first-degree tampering, stealing over $500, and fraudulent use of a credit card device in October 2013. He also pleaded guilty in December 2015 to two counts of resisting a lawful stop.

Prosecutors have not yet specified charges against the five defendants.

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