ST. LOUIS COUNTY, Mo. – A day after a brother and sister were gunned down in St. Louis County, prosecutors have filed charges against the suspected shooter.

According to detectives with the St. Louis County Police Department’s Bureau of Crimes Against Persons, the shooting took place around 9:35 a.m. Sunday in the 10700 block of Wurdack Avenue, located in an unincorporated part of the county just south of St. Ann and west of Overland.

Officers arrived at the scene and found Marc Rhodes Jr., 19, suffering from a gunshot wound in the driveway of a home. They located Lanija Cooper, 20, a short distance away. Both victims were pronounced dead at the scene.

Police were able to recover a gun as part of the investigation and took Lamarr Harris, 19, into custody.

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Investigators claim Harris suspected Cooper, whom he had a prior romantic relationship with, had slashed his new girlfriend’s tires the previous evening. Harris took a Lyft to the house where Cooper and Rhodes were staying. He had a .40 caliber pistol in his possession.

Investigators claim Harris confronted Rhodes outside the home and the two got into an argument. Rhodes punched Harris in the face. Harris took out his gun and shot Rhodes.

The St. Louis County Prosecuting Attorney’s Office charged Harris with second-degree murder and armed criminal action in Rhodes’ death. Charges for Cooper’s death are currently under advisement. Harris remains jailed on a $750,000 cash-only bond.