The younger brother of a man already charged in Holly Bobo's murder has been arrested and charged in relation to the crime.

Agents from the Tennessee Bureau of Investigation arrested John Dylan Adams on Wednesday evening (Sept. 17) and charged him with tampering with evidence in the case.

According to the Jackson Sun, an affidavit gave the details for the arrest, saying, "On September 17, 2014, this agent heard Dylan Adams tell other agent with the Tennessee Bureau of Investigation that on April 13, 2011, Dylan Adams disposed of item(s) he knew possessed evidentiary value relating to Holly Bobo ... This offense did occur in Decatur County."

Adams' brother, Zachary Adams, was indicted on charges of first-degree murder and especially aggravated kidnapping in March, nearly three years after the 20-year-old nursing student disappeared from her family's home in Darden, Tenn.

TBI spokesperson Josh DeVine says John Dylan Adams was arrested on a warrant but has not been indicted.

"We are going to do whatever it takes to find justice for the friends and family of Holly Bobo and follow evidence where it might lead," he states.

The TBI have also announced an additional charge of coercion of a witness against Zachary Adams after he allegedly told a fellow inmate at the Chester County Jail to pass a message to his brother, who was being held in the Obion County Jail. The Sun reports the message said, "Tell my brother he is the one who started this [expletive] and if he don't shut his mouth he will be in the hole beside her."

John Dylan Adams was already being held on federal charges stemming from a Sept. 16 indictment that he "possessed, received, concealed, stored, bartered, sold and disposed of a stolen firearm" on or about July 13, 2013. The Madison County Sheriff's Department took him into custody on Sept. 25 and turned him over to the U.S. Marshals Service after his arrest warrant was issued on Sept. 16 on the new charges.

Jason Wayne Autry, 39, has also been charged with especially aggravated kidnapping and first-degree felony murder in Bobo’s case. Both he and Zachary Adams have pleaded not guilty.

Brothers Jeffrey Pearcy and Mark Pearcy were arrested in May and charged with tampering with evidence and accessory after the fact, after a woman named Sandra King told authorities that Jeffrey had showed her a cell phone video of Bobo tied up and crying.

Holly Bobo's remains were found in Decatur Country, Tenn., in early September. Decatur County Sheriff Keith Byrd told reporters at that time that he believed more arrests were forthcoming in the case.