Outside Boston, the lead investigator might be an asset for the defense. In Michigan, no physical evidence of actual murder? No problem. And in Ohio, a 13-year investigation ends in seconds.

Dateline producer Mario Garcia reports from a Long Island courtroom just after prosecutors charged the alleged serial killer with the murders of Sandra Costilla in 1993 and Jessica Taylor in 2003.

An alleged serial killer is facing more charges. A TikTok star charged with murder finds out if his performance on the stand was convincing. And an avowed Nazi kills a classmate. The only question is why.