Introducing a new investigative true crime series: "Radioactive: The Karen Silkwood Mystery."

Karen Silkwood’s death 50 years ago this November continues to haunt Oklahoma and the nation. The 28-year-old plutonium plant worker died in a fatal crash while driving to meet a reporter with The New York Times allegedly to deliver evidence documenting unsafe conditions at the plant. Two reporters who covered the Silkwood story in 1974 have spent years trying to piece together what many in Oklahoma speculate: Karen Silkwood may have died for what she knew. Fifty years later, hear newly-discovered investigative tapes, deathbed conversations and long-awaited interviews reexamining what happened that night.

Listen to Ep. 1 on Apple Podcasts, Spotify, Amazon Music, or wherever you get your podcasts.

In this bonus episode, now-retired Detective Kenny Silvia and two of Burke O'Brien's sisters open up to ABC News' Christina Kiely about how the case has impacted their lives. Support this podcast with a review ----> http://bit.ly/2x6pt17 *** Check out our new series, "A Killing On the Cape." Listen and subscribe: http://apple.co/2z2k2E2 *** ** Subscribe to "Start Here," the new daily podcast from ABC News, available on Apple Podcasts (https://apple.co/2pvq8Ws), Google Podcasts (http://bit.ly/2JZSK70), or your favorite podcast app! "A Murder On Orchard Street" is a production of ABC News Nightline, ABC Radio & ABC News Digital. Subscribe to the daily "Nightline" podcast on Apple Podcasts (http://apple.co/2kBeFp9) or wherever you're listening right now. Find more ABC podcasts at http://www.abcnewspodcasts.com.

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Detective Kenny Silvia and ABC News reporter Christina Kiely head to Florida looking for answers. Could this finally be the missing piece? Support this podcast with a review ----> http://bit.ly/2x6pt17 *** Check out our new series, "A Killing On the Cape." Listen and subscribe: http://apple.co/2z2k2E2 *** ** Subscribe to "Start Here," the new daily podcast from ABC News, available on Apple Podcasts (https://apple.co/2pvq8Ws), Google Podcasts (http://bit.ly/2JZSK70), or your favorite podcast app! "A Murder On Orchard Street" is a production of ABC News Nightline, ABC Radio & ABC News Digital. Subscribe to the daily "Nightline" podcast on Apple Podcasts (http://apple.co/2kBeFp9) or wherever you're listening right now. Find more ABC podcasts at http://www.abcnewspodcasts.com.

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Thirteen years after the murder, Detective Kenny Silvia reaches out to ABC News reporter Christina Kiely for help in bringing closure to the case. Support this podcast with a review ----> http://bit.ly/2x6pt17 *** Check out our new series, "A Killing On the Cape." Listen and subscribe: http://apple.co/2z2k2E2 *** ** Subscribe to "Start Here," the new daily podcast from ABC News, available on Apple Podcasts (https://apple.co/2pvq8Ws), Google Podcasts (http://bit.ly/2JZSK70), or your favorite podcast app! "A Murder On Orchard Street" is a production of ABC News Nightline, ABC Radio & ABC News Digital. Subscribe to the daily "Nightline" podcast on Apple Podcasts (http://apple.co/2kBeFp9) or wherever you're listening right now. Find more ABC podcasts at http://www.abcnewspodcasts.com.

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A bump in the case brings the investigation to a screeching halt when a new witness steps forward, and another narrative takes shape. Support this podcast with a review ----> http://bit.ly/2x6pt17 *** Check out our new series, "A Killing On the Cape." Listen and subscribe: http://apple.co/2z2k2E2 *** ** Subscribe to "Start Here," the new daily podcast from ABC News, available on Apple Podcasts (https://apple.co/2pvq8Ws), Google Podcasts (http://bit.ly/2JZSK70), or your favorite podcast app! "A Murder On Orchard Street" is a production of ABC News Nightline, ABC Radio & ABC News Digital. Subscribe to the daily "Nightline" podcast on Apple Podcasts (http://apple.co/2kBeFp9) or wherever you're listening right now. Find more ABC podcasts at http://www.abcnewspodcasts.com.

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The district attorney decides there is not enough evidence to prosecute Forrest, and a surprise call to the precinct upturns everything. Support this podcast with a review ----> http://bit.ly/2x6pt17 *** Check out our new series, "A Killing On the Cape." Listen and subscribe: http://apple.co/2z2k2E2 *** ** Subscribe to "Start Here," the new daily podcast from ABC News, available on Apple Podcasts (https://apple.co/2pvq8Ws), Google Podcasts (http://bit.ly/2JZSK70), or your favorite podcast app! "A Murder On Orchard Street" is a production of ABC News Nightline, ABC Radio & ABC News Digital. Subscribe to the daily "Nightline" podcast on Apple Podcasts (http://apple.co/2kBeFp9) or wherever you're listening right now. Find more ABC podcasts at http://www.abcnewspodcasts.com

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Detective Kenny Silvia is looking for a motive and thinks he's found one, but Forrest's interrogation leaves him with doubts. Support this podcast with a review ----> http://bit.ly/2x6pt17 ** Subscribe to "Start Here," the new daily podcast from ABC News, available on Apple Podcasts (https://apple.co/2pvq8Ws), Google Podcasts (http://bit.ly/2JZSK70), or your favorite podcast app! "A Murder On Orchard Street" is a production of ABC News Nightline, ABC Radio & ABC News Digital. Subscribe to the daily "Nightline" podcast on Apple Podcasts (http://apple.co/2kBeFp9) or wherever you're listening right now. Find more ABC podcasts at http://www.abcnewspodcasts.com

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The detectives have an eyewitness who says he saw Burke get shot and knows who did it. Twenty-four hours in, the team is ready to make an arrest, but Detective Silvia has his doubts. Support this podcast with a review ----> http://bit.ly/2x6pt17 ** Subscribe to "Start Here," the new daily podcast from ABC News, available on Apple Podcasts (https://apple.co/2pvq8Ws), Google Podcasts (http://bit.ly/2JZSK70), or your favorite podcast app! "A Murder On Orchard Street" is a production of ABC News Nightline, ABC Radio & ABC News Digital. Subscribe to the daily "Nightline" podcast on Apple Podcasts (http://apple.co/2kBeFp9) or wherever you're listening right now. Find more ABC podcasts at http://www.abcnewspodcasts.com

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It's winter 2003. 25-year-old banker Burke O'Brien is murdered in cold blood on a January morning in downtown Manhattan. As Burke's family mourns the loss of their son, detective Kenny Silvia is assigned the case and working to put a killer behind bars. Support this podcast with a review ----> http://bit.ly/2x6pt17 ** Subscribe to "Start Here," the new daily podcast from ABC News, available on Apple Podcasts (https://apple.co/2pvq8Ws), Google Podcasts (http://bit.ly/2JZSK70), or your favorite podcast app! "A Murder On Orchard Street" is a production of ABC News Nightline, ABC Radio & ABC News Digital. Subscribe to the daily "Nightline" podcast on Apple Podcasts (http://apple.co/2kBeFp9) or wherever you're listening right now. Find more ABC podcasts at http://www.abcnewspodcasts.com

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Every homicide leaves a wake of unexpected victims and inspires unexpected champions. An ex-NYC detective returns to the scene of an unsolved homicide, reuniting with the victim's sister and reaching out for help from the reporter who filmed the case moment-to-moment in 2003, in one last attempt to solve the crime and bring the murderers to justice. Support this podcast with a review ----> http://bit.ly/2x6pt17 ** Subscribe to "Start Here," the new daily podcast from ABC News, available on Apple Podcasts (https://apple.co/2pvq8Ws), Google Podcasts (http://bit.ly/2JZSK70), or your favorite podcast app! "A Murder On Orchard Street" is a production of ABC News Nightline, ABC Radio & ABC News Digital. Subscribe to the daily "Nightline" podcast on Apple Podcasts (http://apple.co/2kBeFp9) or wherever you're listening right now. Find more ABC podcasts at http://www.abcnewspodcasts.com

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