Anne-Marie Green

And when investigators looked at that night, they learned Bud Ackerman had been tracking Davis and Meredith's whereabouts for hours.

Using security video, phone records, and even data from Bud's own truck, authorities built a timeline. They began with Meredith's phone, Lieutenant Matthew Womack of the Greenwood County Sheriff's Office.

Using security video, phone records, and even data from Bud's own truck, authorities built a timeline. They began with Meredith's phone, Lieutenant Matthew Womack of the Greenwood County Sheriff's Office.

Using security video, phone records, and even data from Bud's own truck, authorities built a timeline. They began with Meredith's phone, Lieutenant Matthew Womack of the Greenwood County Sheriff's Office.

A slew of calls and text messages Bud had made to Meredith leading up to the collision. At 8.54 p.m., Bud texts Meredith, why do you hate me? I just don't understand. She doesn't respond to him. She's out with Davis at a local restaurant.

A slew of calls and text messages Bud had made to Meredith leading up to the collision. At 8.54 p.m., Bud texts Meredith, why do you hate me? I just don't understand. She doesn't respond to him. She's out with Davis at a local restaurant.

A slew of calls and text messages Bud had made to Meredith leading up to the collision. At 8.54 p.m., Bud texts Meredith, why do you hate me? I just don't understand. She doesn't respond to him. She's out with Davis at a local restaurant.

and being interrupted by Bud's attempts to reach her. What was the FaceTime conversation like?

and being interrupted by Bud's attempts to reach her. What was the FaceTime conversation like?

and being interrupted by Bud's attempts to reach her. What was the FaceTime conversation like?

So at that point, he knows that you're out with Davis. Mm-hmm. While Meredith continued her date with Davis, security cameras catch Bud Ackerman at 1040 p.m., arriving at a popular Greenwood club called Key West.

So at that point, he knows that you're out with Davis. Mm-hmm. While Meredith continued her date with Davis, security cameras catch Bud Ackerman at 1040 p.m., arriving at a popular Greenwood club called Key West.

So at that point, he knows that you're out with Davis. Mm-hmm. While Meredith continued her date with Davis, security cameras catch Bud Ackerman at 1040 p.m., arriving at a popular Greenwood club called Key West.

The video shows Bud spent about an hour and a half at Key West, then called Meredith again. How did he sound on the phone? Intoxicated. What's an intoxicated Bud sound like? Vulgar. Soon after midnight, Ackerman had left Key West. About a half hour later, cameras show Bud's truck circling in front of Break on the Lake. But by then, Meredith and Davis were no longer at the restaurant.

The video shows Bud spent about an hour and a half at Key West, then called Meredith again. How did he sound on the phone? Intoxicated. What's an intoxicated Bud sound like? Vulgar. Soon after midnight, Ackerman had left Key West. About a half hour later, cameras show Bud's truck circling in front of Break on the Lake. But by then, Meredith and Davis were no longer at the restaurant.

The video shows Bud spent about an hour and a half at Key West, then called Meredith again. How did he sound on the phone? Intoxicated. What's an intoxicated Bud sound like? Vulgar. Soon after midnight, Ackerman had left Key West. About a half hour later, cameras show Bud's truck circling in front of Break on the Lake. But by then, Meredith and Davis were no longer at the restaurant.

Lieutenant Womack says before long, investigators would learn just how far Bud Ackerman had gone that night to find Meredith and Davis. Though Ackerman himself wasn't talking, critical information would emerge from another digital witness, his truck.

Lieutenant Womack says before long, investigators would learn just how far Bud Ackerman had gone that night to find Meredith and Davis. Though Ackerman himself wasn't talking, critical information would emerge from another digital witness, his truck.

Lieutenant Womack says before long, investigators would learn just how far Bud Ackerman had gone that night to find Meredith and Davis. Though Ackerman himself wasn't talking, critical information would emerge from another digital witness, his truck.

Womack says in some cars and trucks, the infotainment systems, as they're known, store detailed information about how the vehicles are being driven. We're in a similar model to Bud's Ford F-250 pickup.