Carlos Rodriquez, 25, admitted to strangling Zoe Campos to death five years ago at his home in the 1900 block of 70th Street where he says the two smoked synthetic drugs, according to an arrest warrant released Monday.

The warrant indicates Rodriquez was a person of interest in the case since Campos was reported missing on Nov. 19, 2013. Police on Friday confirmed finding human remains in the backyard of the house Rodriquez once lived in, but were awaiting a Lubbock County Medical Examiner's analysis to confirm its identification.

Although it's not what the Campos family wanted to hear, the news of the discovery and Rodriquez's charge provided some form of closure, said Nina Valdez, an advocate with Voice for the Missing. For the family, Valdez said now the questions of not knowing have led to the how and why all of this information from Rodriquez took this long to come out. "They have a lot of mixed emotions about that," she added. "As a mother, you're going to have the how and the anger and everything that goes with it knowing that somebody knew this whole time. The not knowing is what was the hardest for her. It's devastating, it's all mixed in one."

Campos' mother, Melinda, told A-J media in 2017 that while she was hopeful her daughter was still alive, she had begun steeling herself to a grimmer conclusion. Valdez said no amount of preparation would soften the blow about the news of a loved one's death. "The impact was just as devastating," she said. With a whole new level of grief added, the Campos family wanted to express their gratitude for sharing Campos' story, which went international, said Valdez.

"It's so heartbreaking," she said. "It's not the news you want to get. We always want to find our children and bring them home safe. This one is just really devastating. But in a sense, we all felt relief that (Melinda Campos) is not going to have to wake up and wonder where she is at again." Melinda Campos reported Zoe Campos, who was 18 at the time, missing two days after her daughter sent her a 2 a.m. text message saying she was on her way to fetch her from work. Her daughter never came, which was unusual, she said. When Campos arrived at her home, Zoe wasn’t there.

Melinda Campos told A-J Media in 2013 that she believed her daughter was at their home when she sent the text message. In 2017, Campos said she learned that her daughter may have been at a friend's place when she texted. "From what I’m understanding, is when she texted me, she was at this person’s house," Campos said. "And she made up an excuse to get away."

The day after Melinda Campos' report, her sister spotted Zoe's car, a silver Lincoln Town car, and followed it to the Driftwood Apartments in the 5500 block of Utica Avenue where the driver abandoned it and ran away. Investigators searched the vehicle and recovered Campos' jacket.

In the 2017 interview, Campos told A-J media her conversations with investigators over the years led her to believe one person knew what happened to her daughter the night of her disappearance. She didn't identify the man, but said police used cadaver dogs to search his home and cell phone records showed her daughter's cell phone was within a mile of where the man's residence. "Apparently she met this guy through a friend of hers that just had baby," she said. "That night she went to go see her and give her congratulations and then went back home to the apartment. But this is where she met that last person."

However, the warrant indicates that Zoe Campos never made it back to the apartment she shared with her mother and sister. At the beginning of the case, investigators collected cellphone tower data of Zoe Campos' cellphone, which showed it was in the area of Rodriquez' house in the 1900 block of 70th Street before her disappearance. The warrant states he lived at that home until the latter part of 2014.

Investigators spoke with Rodriquez, who gave investigators different stories. He initially minimized his relationship with Campos, saying he met her earlier in the day through a friend and denied involvement in her disappearance. He later admitted to lying about his relationship and said the two communicated on Facebook and smoked marijuana at his home.

In 2014, investigators searched around the property using cadaver-sniffing dogs. The dogs detected the scent of death at the time in the backyard and in the alley, but investigators could not find a grave site. Investigators interviewed Rodriquez multiple times in 2015 and 2016 during which he displayed deceptive behavior. In 2016, forensic analysts found Rodriquez's DNA inside the jacket recovered from Campos' car. Investigators confronted Rodriquez with the DNA evidence and he denied touching Campos in any way but said she was in his bedroom.

Rodriquez told the investigators he couldn't tell them what happened and that things "didn't look good," the warrant states. Investigators collected more evidence against Rodriquez, including DNA and statements from people who investigators believed Rodriquez confided in that Campos was dead and buried in the backyard. Rodriquez has been held at the Lubbock County Detention Center since November 2017 when Lubbock police arrested him in connection with a stalking charge.

In March, another witness who was an inmate at the jail, told investigators that Rodriquez reportedly told him, “They’ve searched the land already, they’re not gonna find the body until they move the concrete.” One witness, described as a confidential informant, provided investigators with information in July about the case not released to the media. "The (confidential informant) provided information about this investigation that only Carlos Rodriquez would know." On Nov. 7 investigators returned to the residence with cadaver-sniffing dogs and found a bone, which was later determined to have come from an animal.

However, investigators confronted Rodriquez with the bone before confirming its origin and Rodriquez requested a lawyer. In jail phone calls, Rodriquez could be heard saying he told someone what happened and that person had “snitched.” During that conversation, he did not deny that Campos was in the backyard and was certain that Campos’s body was in the backyard of his previous residence, the warrant states.

Later, Rodriquez, waiving his right to counsel, reopened communications with investigators and admitted to killing Campos. The warrant states that, in the early morning hours of Nov. 18, 2013, Campos drove to Rodriquez’s house. The two smoked synthetic marijuana and Rodriquez said he “lost control” and struck Campos and put her in a "rear naked choke" hold and strangled her to death. Rodriquez took Campos’ body to the backyard and buried her in a shallow grave. Rodriquez admitted to driving Campos' car to the Driftwood Apartments where he was almost caught by her aunt.

Rodriquez moved Campos’ body after several months. During the process, he admitted, her foot broke off and he threw it in a dumpster, according to the warrant. He reportedly said he buried her deeper underground in another part of the backyard and laid her over a gas pipe. Rodriquez is being held at the Lubbock County Detention Center. His bail is set at $500,000 for the murder charge. However, he was sentenced to four years in prison after entering a guilty plea in October to the stalking charge.