According to a press release, Noble threw the rifle into a body of water north of Clinton, Mo. knowing that the weapon was used in the crime and meant to hide it from investigators.
Bill Lowe says William Noble of Clinton was taken into custody Thursday and charged with felony tampering with evidence.
Michael was shot after he stopped a driver for a traffic violation.
He is scheduled to be arraigned Friday on charges of first degree murder and armed criminal action.
Lowe said that the relationship between McCarthy and Noble was unclear.
He also was wanted at the time of his arrest on a warrant out of Johnson County, Missouri, issued in 2015 for unlawful possession of a firearm.
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According to a police probable cause statement, Noble began "fake crying" while initially telling two officers who visited his home Thursday that he bought the rifle and sold it to McCarthy. Noble allegedly told police he bought the gun for McCarthy because McCarthy was from out of state. He eventually changed his story and acknowledged that McCarthy asked him to buy the rifle for him.
When Noble asked what kind of weapon was used to kill the officer, an investigator with the highway patrol told him, "He knew the answer to this question", according to the affidavit.
As the officers were getting ready to leave, one of them asked Noble if he knew where the gun was. He said he panicked, told his wife he was taking the trash out, and drove north out of town with the gun. He then went with officers to the intersection of NW 300th Road and NW 131st Road. He faces up to four years in prison.
The investigation is continuing and could result in charges against other individuals.
Missouri Highway Patrol officers searching for suspect Ian McCarthy prepare to drive into a field parked with old mobile homes on the outskirts of Clinton, Mo., earlier this week.
McCarthy is in jail and being held without bond, accused of murdering Officer Michael at about 10:45 p.m. Sunday, August 6th. The bullets that hit Michael ultimately killed him.