Investigators use an unlikely clue to bring young mom's killer to justice

On Oct. 15, 2019, Joseph Elledge walked into the Columbia, Missouri Police Department without a lawyer to tell detectives about the mysterious disappearance of his 28-year-old wife, Mengqi Ji — six days earlier.

JOE ELLEDGE (police interview): We didn't have any big fights ... I think the last big fight was actually the week before. And it wasn't really a big fight.

The 23-year-old described his wife as tense and withdrawn the night before she disappeared, so he gave her a massage.