( CNN ) -- A woman accused of killing her 2-year-old daughter and dumping her body in Galveston Bay in Texas has pleaded guilty to tampering with evidence in the case . Kimberly Dawn Trenor is scheduled to go on trial for murder next week in the death of her daughter . But Kimberly Dawn Trenor , 20 , pleaded not guilty to the capital murder charge , her lawyer said Wednesday . Trenor and her husband , Royce Clyde Zeigler II , 25 , both were charged with tampering with evidence and capital murder in the case of Riley Ann Sawyer , whose body was found in a large blue plastic container on an uninhabited island in Galveston Bay , Texas , in October 2007 . The charge of tampering with evidence accused the couple of concealing the child 's remains . Trenor was arraigned Tuesday in Galveston , Texas , said her lawyer , Tom Stickler . Jury selection for her trial on the capital murder charge begins Wednesday . The trial will begin in earnest on January 27 , he said . The jury also will sentence Trenor on the evidence tampering charge , which carries a penalty of two to 20 years in prison , The Houston Chronicle reported . Zeigler , who is being tried separately , has not been formally arraigned , Stickler said . Both remain in jail . The Houston Chronicle reported bail had been set at $ 850,000 each . Riley Ann 's case garnered national headlines after a fisherman found her body on the island in the bay . Authorities were unsure of her identity , and police dubbed her `` Baby Grace . '' Police distributed composite sketches of the girl nationwide , and Sheryl Sawyers , the girl 's paternal grandmother , contacted police from her Ohio home to say the drawing resembled her granddaughter . DNA testing confirmed the child 's identity . According to an affidavit , Trenor told police Riley had been beaten and thrown across a room and that her head was held underwater before she died on July 24 , 2007 . She said the couple hid the girl 's body in a storage shed for one to two months before they put it in the plastic container and dumped it into the bay . A medical examiner said Riley 's skull was fractured in three places , injuries that would have been fatal . A cross has since been erected on the island where the child was found , which was named Riley 's Island in her honor , the Houston Chronicle reported . Trenor moved to Texas from Ohio with the girl in May 2007 to be with Zeigler , whom Trenor had met on the Internet . While in custody , Trenor gave birth this summer to another child , who is now in the care of relatives , Stickler said .
Kimberly Dawn Trenor pleads guilty to tampering with evidence . She faces capital murder trial in death of child known as 'Baby Grace ' Child 's body was found in plastic container on island in Galveston Bay .