Two Shallow Graves

The fate of the missing McStay family remains a mystery for three years until their bodies surface in two shallow graves in the desert. Prosecutors accuse Chase Merritt of the crime, and the trial begins with each side passionately presenting their case.

A witness upends the Merritt murder trial. Plus, Merritt's girlfriend gives him an alibi, but the prosecution attempts to discredit her on the witness stand.

Police investigate other suspects, including a business associate and an ex-boyfriend. Plus, surveillance video of a truck near the scene may reveal the killer.

Merritt's phone pings near the desert graves. Prosecutors suggest he tried to delete financial records to cover his tracks. A lawyer suddenly leaves the trial.

New DNA found in the graves may reveal who murdered the McStays. And, the defence questions Joseph's brother on his whereabouts at the time of the murders.

If Merritt testifies, the jurors will learn about his criminal past. The defence and prosecution present their final arguments with closing statements.

Merritt believes an expert witness can prove phone records placing him at the gravesite are "impossible." Plus, another key figure in the case emerges.