Details of the investigation into the Delphi Murders trickle out in court. And what the jurors are shown is disturbing. In the trial of the man accused of killing a tech executive, the defendant's sister undercuts his theory -- and the prosecution's. Khazar Momeni has been on the stand all week. Plus Sarah Boone, charged with killing her boyfriend by zipping him into a suitcase, is testifying. And NBC News's Vicky Nguyen is back with advice for your kids as they roam the streets in costume. Find out more about the cases covered each week here: www.datelinetruecrimeweekly.com

Two long-awaited trials begin. A local Indiana man is accused of stabbing two middle schoolers to death and leaving their bodies next to a creek. He says he’s innocent. And in Silicon Valley, another stabbing death. After a tech executive was stabbed through the heart in 2023, his killer admitted he did it. The question at trial is why? Plus, six new lawsuits are filed against Sean “Diddy” Combs and Keith Morrison drops by to talk about his new podcast, "The Man in the Black Mask."

Find out more about the cases covered each week here: www.datelinetruecrimeweekly.com

Since a Massachusetts State Trooper's "regrettable" text messages were revealed on the stand in June, a defense attorney is asking what he texted about other investigations, including the disappearance of Ana Walshe. In West Virgina, a scam turns into a poisoning by insulin charge. And for Domestic Violence Awareness Month, some tips on how to help friends in an abusive relationship.

Get resources on domestic violence: https://www.thehotline.org/
Learn more about the One Love Foundation: https://www.joinonelove.org/

A Florida woman is charged with killing her boyfriend by zipping him into a suitcase and refusing to let him out. She says it was an accident. And just outside Washington, D.C., a young mother vanished in July. Her husband was arrested a month later, and prosecutors now say they have evidence connecting her disappearance to his visits to dumpsters across Northern Virginia. He claims she’s still alive. And automotive expert Lauren Fix has tips on how to stay safe on and off the road.

In Florida, the trial of Donna Adelson -- accused of masterminding a hit on her daughter's ex-husband -- is derailed. Hear jailhouse phone calls between her and her convicted son. And in San Francisco, the trial for the man accused of killing the co-founder of Cash App last spring is just around the corner. Plus how to avoid becoming one of the millions who fall victim to fraud.

The music legend once known as Puffy, Puff Daddy and Diddy was arraigned in open court this week. NBC News correspondent Chloe Melas was there. And in a northern Virginia suburb, did a man kill his wife and a stranger so he could be with their au pair? Plus, talking to longtime Dateline producer Dan Slepian about his book, "The Sing Sing Files", chronicling his decades uncovering wrongful convictions.

In Minnesota, arguments over evidence in the run-up to a poison specialist's murder trial, and, in South Carolina, a reckoning for the longtime girlfriend of a convicted killer. WMBF reporter Ashley Boles was in the courtroom for the suspenseful plea hearing. Plus, tips from Today show senior investigative correspondent Vicky Nguyen on dorm room dangers.

In suburban Boston, years after the death of a pregnant 23-year-old was ruled a suicide, the FBI arrest a former local detective for her murder. In Lake County, Florida, a mom on trial for her husband's murder is raising a wildcard defense: her daughter did it. And Dr. Mary Jumbelic answers our question: how can medical examiners reach different conclusions in the same cases?

NBC Boston's coverage of Sandra Birchmore's case