Unsolved Murder
Richard Allen faces two counts of murder in the deaths of Abby Williams, 13, and Libby German, 14.
The macabre murders have puzzled investigators for nearly a decade.
Steve Pankey, 64, said police in Colorado have named him as a person of interest in 12-year-old Jonelle Matthews' death.
"We know what happened to Nanette Krentel," said an investigator. The only mystery is the coroner's ruling.
WHAT'S HAPPENING
Nathan Carman was a suspect in the 2013 murder of his grandfather, which is still unsolved.
"At first, it looked like a sack floating. Then I saw it was the body of a girl."