Dateline: True Crime Weekly

Details of the investigation into the Delphi Murders trickle out in court. And in the trial of the man accused of killing a tech executive, the defendant's sister undercuts his theory -- and the prosecution's.

Two long-awaited trials begin. One the double murder of two teenage girls and the other the stabbing death of a tech mogul. And the latest legal troubles for Sean “Diddy” Combs.

After a Massachusetts State Trooper's "regrettable" text messages were revealed on the stand in one trial, other cases he worked on come under scrutiny. And a West Virgina scam ends in a murder charge.

Trial is set to start for the woman accused of zipping her boyfriend into a rolling suitcase, suffocating him to death. And newly revealed evidence against a man whose wife has been missing since July.

Donna Adelson's trial is derailed. In San Francisco, the trial for the man accused of killing the co-founder of Cash App is just around the corner. And how to avoid becoming one of the millions who fall victim to fraud.

The music legend once known as Puff Daddy was arraigned in open court this week. NBC News correspondent Chloe Melas was there. And did a man kill his wife and a stranger so he could be with their au pair?

Arguments over evidence in the run-up to a poison specialist's murder trial. A reckoning for the longtime girlfriend of a convicted killer. And tips from a Today show correspondent on dorm room dangers.

A bombshell arrest in the Sandra Birchmore case. In Florida, will a woman's daughter take the stand in her defense? And how medical examiners can reach different conclusions in the same cases.

Kouri Richins fails to get her case tossed out. Will the University of Idaho student murders trial move from a college town to the big city? And how to talk to your child about sexting.

An American woman disappears in Madrid, and the prime suspect tries to get out on bond. In Las Vegas, Robert Telles takes the stand. And a docuseries about Dr. Henry Lee.

A father and a son are among those arrested in a stabbing death at an after hours party. What it takes to clear a rape kit backlog. And why so many poisonings lately?

Keith Morrison on the trial of a woman who killed her bronze medalist husband. The Blade Runner, who gunned down his girlfriend, is out on parole. And a self-defense expert with advice for joggers.

Ashley Benefield is convicted of manslaughter. Could San Diego police have done more to prevent a murder? And after a third high-profile hung jury in two months, we ask a jury expert what's going on.

Openings in a Florida murder trial. In Massachusetts, protestors take to the streets again -- this time for Sandra Birchmore. And a criminal defense attorney with some tips.

A Florida woman some are calling the Black Swan claims self-defense. In Atlanta, the judge presiding over Young Thug's trial has been replaced. Plus, what to consider before you get in a stranger's car.

After several jaw-dropping moments in court last week, the judge threw out the charge against him. NBC News' Chloe Melas breaks down the final hours of his trial.

The actor could face prison time if convicted on an involuntary manslaughter charge. A man explains why he lied to police in the Woll case. And Josh Mankiewicz wants to talk about the missing in America.

The murder trial in a Boston suburb may have ended in a hung jury, but news keeps breaking around the case. Jury selection in the actor's New Mexico trial is next week. Plus, how to stay safe on the road.

Dateline producer Sue Simpson reports from Dedham, Mass. where jurors in the trial of a woman accused of killing her police officer boyfriend couldn't reach a verdict.

Hundreds are on verdict watch in Dedham, Mass., while in Arizona parents are demanding answers after a 16-year-old was beaten to death. And in Michigan, an ex-boyfriend calls 911 on himself.

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.

Peterson’s defense team asks for new DNA testing. The woman accused of ordering a hit on her ex-husband wants out of jail. And a state trooper who staged his wife’s suicide gets the book thrown at him.

An intense cross-examination in a Boston area courtroom. Utah grief author facing murder charges sends Dateline jailhouse recordings. And a legal logjam in the Idaho student murders case.

The actor's defense team argues to dismiss while Lori Vallow's husband stands trial and the state presents its case against the Boston woman accused of running over her police officer boyfriend.

Every Thursday Andrea Canning and her guests dive into the biggest crime stories around the country. Stay up to date and go behind the scenes as she talks to local reporters, experts and her fellow correspondents.