A 30-year-old Texas man is accused of using a fake social media profile to lure at 16-year-old girl to her death in order to prevent her from testifying against him in a rape trial, according to an arrest warrant affidavit.

Sixteen-year-old Shania Gray was reported missing on September 7. Gray’s mother told police she went to her daughter’s school the day before to pick her up but couldn’t find her, the affidavit stated.

Cell phone records revealed Franklin Davis, 30, had been in contact with Gray on September 6, according to the affidavit. Those phone records also placed Davis’ and Gray’s cell phones in the same areas at the same times, police said.

In an interview with police, Davis admitted to authorities he “contacted Gray through a social media site and purported himself to be someone else,” court documents said. Davis allegedly told authorities he gained Gray’s trust “in order to collect evidence about the criminal offense that Gray had reported in March of 2010.”

In March of 2010, Gray reported that she was a victim of a felony criminal offense in which Davis was the suspect, police said in the affidavit. Online records confirmed Davis was charged in July of 2011 with 4 counts of sexual assault of a child. He was released from jail in August of 2011 after posting a $25,000 bond.

“I was accused of sexually assaulting her when I didn’t,” Davis said from behind bars in an interview with CBS 11 News.

After gaining Gray’s confidence, Davis told police he used a pre-paid cell phone to arrange a meeting with her at her high school on September 6, according to court documents. Cell phone records placed Davis’ and Gray’s cell phones at the school around 4 p.m. that day, police said in the affidavit.

When Davis arrived at Gray’s high school, she was surprised to see him but she got into his car and they drove to a trail head at Champion Trail, police said Davis told them.

Davis told police Gray saw a .380 pistol he had in his possession during the drive, according to the affidavit. At one point, Gray asked him if he was going to hurt her and he replied that he only wanted to talk to her about the March 2010 case, Davis allegedly told police.

After they got out of the car and began walking toward the Trinity River, Davis told authorities he used the pistol to shoot Gray twice, authorities said in the affidavit.

Davis said Gray partially fell into the river after he shot her and began asking, “Why, Wish?” a nickname that Davis admitted to using, according to the affidavit. “Davis then reached down and pulled Gray up onto the bank. Davis stated he then stepped on her neck until she stopped breathing,” the affidavit stated.

Investigators said they discovered Gray’s body in a park alongside the Trinity River. Davis led detectives to the location where he killed Gray and the pond where he tossed the murder weapon, police said in the affidavit.

In an interview with CBS 11 News, Davis claims that before he killed Gray, the two made a deal that she would deny everything regarding the March 2010 case.

“I turned around and walked off intending to leave her down there and it was like a different side of me came out,” Davis told CBS 11 News. “It wasn’t me who actually came out. It was like a light switch, once it hit, a dark side came out of me.”

After admitting to shooting Gray twice, Davis told CBS 11 News, “It took her to say, ‘Why Wish?’ to bring me back to who I was. It switched back on and before I realized it, I stepped on her neck.”

Davis was charged with capital murder and is being held at the Dallas County Jail with bail set at $2 million. He told CBS 11 News he is “100% remorseful” for what he has done.

HLN was unable to reach Davis or his attorney for a comment.