In Massachusetts, former Stoughton police officer Matthew Farwell is on trial for the alleged murder of 23-year-old pregnant teacher's aide Sandra Birchmore. His defense attorney says she died by suicide. In North Carolina, prosecutors are trying the man they say killed University of North Carolina student Faith Hedgepeth 14 years ago. Her roommate faces tough questions from the defense. In Dateline Round Up, updates in the case of Lee Gilley, the man accused of killing his pregnant wife and fleeing to Italy. And trial continues for Naresh Bhatt, accused of killing his wife in Northern Virginia. Plus, resources for students who experience crime on campus.

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

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Keith Morrison sits down with Josh Mankiewicz to discuss his latest episode, “Heartless.”

When 53-year-old Talina Galloway went missing from her Oklahoma home in March 2020, her friends knew something was awry. Police began looking into her disappearance, as did a group of online sleuths who called themselves “Talina’s Army.” Eventually, the investigation led police to Talina’s body and to her killer, who was all too close to home. Josh and Keith discuss the ways armchair detectives can help and hurt investigations, as well as the sci-fi subculture that formed a major part of Talina’s life. Then, Josh answers your questions from social media.

Listen to the full episode of “Heartless”: https://swap.fm/l/dl_heartless

Have a question for Talking Dateline? Send us a DM @DatelineNBC or leave a voicemail at (212) 413-5252. Your question could be featured in an upcoming episode.

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When Talina Galloway goes missing during the early days of the pandemic in 2020, investigators and online sleuths calling themselves “Talina’s Army" search for answers. Josh Mankiewicz reports.

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