Holly Bobo murder suspect faces new charge

MEMPHIS, Tenn. - Authorities have added a charge of witness coercion against a man accused of kidnapping and killing Tennessee nursing student Holly Bobo after he allegedly tried to threaten his own brother, who is also in jail, according to a court affidavit obtained by CBS affiliate WTVF.

The Tennessee Bureau of Investigation (TBI) says agents served an arrest warrant on the new charge against 29-year-old Zachary Adams on Tuesday.

An inmate told TBI investigators that when Adams learned that inmate was going to be transferred to the Obion County Jail, where Adams' brother is being held, he asked the inmate to pass a message along to his brother, according to the affidavit. The station reports that the message said, in part, "He's the one who started this s*** and if he don't shut his mouth he will be in the hole beside her."

Adams was already being held without bond in Chester County on first-degree murder and aggravated kidnapping charges in the Bobo case. He has pleaded not guilty.

Bobo was 20 when she disappeared from her home near Parsons in Decatur County on April 13, 2011. Her body has not been found. The case went cold until Adams was arrested in late February.

Adams' brother, John Dylan Adams, is serving time in prison on federal firearms charges. He was indicted in September 2013.