Art Viveros (FBI Agent)

And investigators were about to get another chance to see if one of the four men they dubbed the A-Train had something to do with what happened to Holly Bobo.

And investigators were about to get another chance to see if one of the four men they dubbed the A-Train had something to do with what happened to Holly Bobo.

By February 2014, Holly had been missing for almost three years. Agent Dykus had been taken off the case. FBI agent Art Viveros had retired. And Zach Adams was on law enforcement's radar for something new. He was arrested and charged with aggravated assault for allegedly holding a gun to the head of his girlfriend's sister and threatening to kill her.

By February 2014, Holly had been missing for almost three years. Agent Dykus had been taken off the case. FBI agent Art Viveros had retired. And Zach Adams was on law enforcement's radar for something new. He was arrested and charged with aggravated assault for allegedly holding a gun to the head of his girlfriend's sister and threatening to kill her.

TBI agents saw Zach's arrest as a chance to question him again about Holly Bobo. While being questioned, Zach said he knew nothing about Holly and was innocent.

TBI agents saw Zach's arrest as a chance to question him again about Holly Bobo. While being questioned, Zach said he knew nothing about Holly and was innocent.

Zach went through what he did the day Holly was kidnapped, which matched what his brother Dylan had told the FBI agent years before. He said that when Holly was abducted, he and his brother were sleeping. Then they spent the morning trying to buy drugs with their friend Shane Austin.

Zach went through what he did the day Holly was kidnapped, which matched what his brother Dylan had told the FBI agent years before. He said that when Holly was abducted, he and his brother were sleeping. Then they spent the morning trying to buy drugs with their friend Shane Austin.

He said they heard about what happened to Holly when they stopped at a gas station and then spent the next few hours just driving around. But TBI agents pushed him. They said if he was hiding anything, they would know very soon. They were going to search his home and send what they found to a crime lab.

He said they heard about what happened to Holly when they stopped at a gas station and then spent the next few hours just driving around. But TBI agents pushed him. They said if he was hiding anything, they would know very soon. They were going to search his home and send what they found to a crime lab.

Over the course of more than two hours, all the suspicions about Zach that had built up for years were laid out. Investigators pointed to Zach's history of drug use and suggested that maybe, while he was high, he did something he didn't mean to do.

Over the course of more than two hours, all the suspicions about Zach that had built up for years were laid out. Investigators pointed to Zach's history of drug use and suggested that maybe, while he was high, he did something he didn't mean to do.

Investigators also told Zach that people were telling them about things he'd said around town about Holly's disappearance.

Investigators also told Zach that people were telling them about things he'd said around town about Holly's disappearance.

The investigators also told him they were going to question people in his life again, including his brother Dylan and his friend Jason Autry.

The investigators also told him they were going to question people in his life again, including his brother Dylan and his friend Jason Autry.

Zach had a consistent response. He knew nothing about Holly's disappearance and was innocent. By the end of the interview, he asked for a lawyer. Zach was transferred to a jail in a nearby county on that pending unrelated charge of assault, which was eventually dismissed.

Zach had a consistent response. He knew nothing about Holly's disappearance and was innocent. By the end of the interview, he asked for a lawyer. Zach was transferred to a jail in a nearby county on that pending unrelated charge of assault, which was eventually dismissed.

But about a week after that long interview, the same TBI agents showed up again to tell him that a grand jury had indicted him on aggravated kidnapping and first-degree murder in the Holly Bobo case. That second charge was significant. It meant that investigators believed Holly had been killed during the kidnapping, even though her body had not been found.

But about a week after that long interview, the same TBI agents showed up again to tell him that a grand jury had indicted him on aggravated kidnapping and first-degree murder in the Holly Bobo case. That second charge was significant. It meant that investigators believed Holly had been killed during the kidnapping, even though her body had not been found.