After new evidence forced a delay in the trial of murdered Tennessee nursing student Holly Bobo, the gun in question produced no notable DNA results, according to reports. Nothing was found to link the weapon to Bobo’s murder, a source told WTVF.

The Arminius model 32 caliber long revolver was discovered underwater in July. The judge in the case granted a delay in order for experts to analyze the gun and the area where it was located. Police indicated there was a bullet wound in Bobo’s skull and wanted to ascertain whether the bullet came from that specific gun. Recent analysis on the badly rusted gun, however, yielded no distinct DNA or fingerprints, a source told WTVF.

Prosecutors appear to have no other forensic evidence linking Bobo’s murder to Zach Adams, who is set to stand trial for the crime.

“At this point, it may be a circumstantial case with no direct evidence linking Adams to the murder of Bobo,” said WTVF legal analyst Nick Leonardo.

Holly Bobo went missing from her family's West Tennessee home in 2011.

Bobo went missing in 2011 in the woods behind her parent’s West Tennessee home. Her body was found three years later near the Adams’ home. Adams, his brother John Adams, and another man, Jason Autry, were all charged with Bobo’s murder, kidnapping and rape. Autry and four others were granted limited immunity by prosecutors to testify against Adams during the trial.

Adams’ defense attorney, Jennifer Thompson, seized upon the lack of DNA evidence pinning her client as the murderer. Thompson has maintained Adam is innocent throughout court proceedings.

“The state has been very clear in their discussions with me that there is no DNA that links Holly Bobo to Zachary Adams,” Thompson said in February.

Adams’ mother also cited the lack of forensic evidence in the case.

“They would have found DNA in that house,” Cindy Adams told WSMV in May. “They would have found hair in that house. They would have found a fingernail. They would have found something that placed Holly in that house. There’s no chemical cleanup in that house. There’s nothing that ever indicated that Holly has been in that house.”

Final motions to move the trial to another county were set to begin Friday. Should there be no further delays, Adams’ trial will begin Monday.