17 year old Sarah Grace Patrick is accused of gunning down her mother and stepfather in Georgia. The defense team of the man accused of killing UNC Chapel Hill student Faith Hedgepeth in 2012 has filed motions that raise new questions about crime scene evidence. Updates on Florida matriarch Donna Adelson's trial and former MLB pitcher Dan Serafini. Plus, an inside look at police interrogations and the tactics investigators use.

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

To learn more about Dateline LIVE in Nashville on Sept. 28, and to get tickets, go here: https://www.nbcnews.com/dateline-event

Blayne Alexander sits down with Keith Morrison to talk about his episode, "In a Lonely Place,” about the disappearance of Chris Smith, a California entrepreneur who vanished in June 2010. For months, his family believed he was traveling the world, thanks to a series of convincing emails. But what a sharp-eyed investigator eventually uncovered led to the truth: Chris had been murdered by his business partner, Ed Shin. Blayne and Keith discuss how the case slowly unraveled, and how Keith’s sit-down with Shin behind bars got testy. Keith also shares an extra clip from his interview with investigator Joe Dalu, whose instincts led him to a critical discovery. Have a question for Talking Dateline? DM us on social @DatelineNBC or leave a voicemail at (212) 413-5252. Your message might be featured in an upcoming episode.

Listen to the full episode In a Lonely Place on Apple: https://apple.co/4mUiPCM

Listen to the full episode on Spotify: https://open.spotify.com/episode/4iZOGhLs4h6XEJoc4ysSPj?si=8221d39ac645491d

Listen to the episode “Body of Evidence” Keith mentions as another unusual interview with a killer here on Apple: https://apple.co/4mpEL8Z

Listen to “Body of Evidence” on Spotify: https://open.spotify.com/episode/6xym79PJkeiO5oMzZ8x8w1?si=0fa4d6d5fabd402e

After California entrepreneur Chris Smith abruptly leaves his business, his family initially believes he is traveling the world until the shocking truth comes to light. Keith Morrison reports.