David Callihan has been deemed competent to stand trial for the murder of a mother and fatal kidnapping of her young daughters in Lousiiana and Mississippi.
Valerie and Melvin Cordell are accused of abusing their eight children for years while forcing them to live in "underground caves," their daughter told police.
Glen Rogers, a convicted serial killer who once claimed to have murdered Nicole Brown Simpson, is set to be executed in Florida.
Surveillance footage showing the Lewis twins hours before their deaths has cast doubt on the murder-suicide theory.
