Police believe a daughter and her fiance killed her mother and tried to do the same to her father in Columbia.
Investigators said Julie Bunch Bauer, 46, poisoned her mother, Phyllis Durham Bunch, in 2008. Investigators initially thought Bunch became ill after eating tainted food at a local restaurant. She died five days later.
Phyllis's husband, Melvin, became sick four weeks after his wife's death. He later recovered from the sickness.
The lead detective in the case wouldn't confirm that the poison used was mercury, despite a report in the Columbia Daily Herald.
Police said Bauer's finance, Joseph Carter, 33, helped her with the poisoning.
Bauer is being held in federal custody in Texas on a charge of violating probation connected with federal embezzlement charges. Carter is being held by federal authorities in Tennessee for previous charges of manufacturing methamphetamine.
Bauer and Carter face charges of first-degree murder, attempted first-degree murder and two counts each of conspiracy to commit first-degree murder.
Detectives have not released a motive in the case.
The Bunches were married for 53 years.
Read more details of this story at the
Columbia Daily Herald's website