FORT BEND COUNTY, Texas (WTVD) -- Amanda Smith Hayes, a North Carolina woman convicted of helping her husband dispose of his ex-girlfriend's body, has now been convicted of trying to dissolve the remains in acid and then throwing them into an alligator-infested creek.In 2014, Smith (formerly Hayes) and her husband Grant Ruffin Hayes III wereProsecutors said the couple killed Ackerson at their Raleigh apartment during a long-running custody dispute over Grant's two oldest children.Ackerson's body was cut up with a power saw, put in coolers, and then driven in a rented U-Haul to Amanda's sister's house in Richmond, Texas.But new details suggest Smith tried to dissolve the remains in acid before throwing them into an alligator-infested Fort Bend County creek,"Once in Richmond, the couple first attempted to use muriatic acid to destroy Ackerson's body," the press release stated. "When that didn't work, they took a boat onto Oyster Creek and dumped Laura's body parts into the water with hopes that alligators would eat her remains."Smith was already sentenced to 13-16 years in prison, while Hayes was sentenced to life.Last week, a jury convicted Smith of tampering with evidence to impair its availability in an investigation, a second-degree felony.According to Chron, she was sentenced to serve 20 years in prison, consecutive to her sentence in North Carolina.