Guilty: Casey Parsons, adoptive mother of murdered Erica Parsons, to spend rest of life in prison

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Casey Parsons admitted in court Friday she killed her own adoptive daughter 13-year-old Erica Parsons in December 2011.

Until Friday, the details surrounding Erica's death remained a mystery.

The District Attorney said Casey's husband, Sandy Parsons, told investigators in 2016 from his federal prison cell that Casey confessed to him in December 2011.

According to the District Attorney, Sandy said, "Casey told me that Erica had died. Casey said Erica committed suicide with pills. Before I woke up, Casey had already put Erica's body inside two plastic trash bags inside a plastic tote."

At the time Sandy started talking, he and Casey had already been convicted of federal fraud charges for getting adoption assistance for Erica, while it turns out she was dead.

Sandy told investigators he and Casey went to South Carolina to bury Erica's body in a shallow grave in December 2011.

According to the District Attorney, Sandy said, "I asked Casey why Erica didn't stink, and she said she poured bleach all over her."

Casey will avoid the death penalty and spend life in prison without parole for pleading guilty. Casey apologized to Erica's biological mom, Carolyn Parsons, in court Friday.

"First I want to say and answer Carolyn why? I can't, I can't tell you why, I don't know why I did the stuff I did, and I'm very sorry. God gave me a precious gift, a baby girl Erica, and he entrusted me to take care of her, and I failed him and I failed Erica."

Carolyn Parsons says she struggled with the decision on the death penalty.

"I feel like a huge part of me betrayed Erica, but I have to understand what we all came together for was justice."