On Friday the 13th, Christine Markle and her daughters are found murdered. A signed confession points to John Markle, but the blood-stained Halloween mask left at the scene raises haunting questions. Watch “The Friday the 13th Murders” Wednesday on ID. | Investigation Discovery
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311K views · 3.5K reactions | John Walsh is back on ID, and he needs your help more than ever. All new season of In Pursuit with John Walsh, Wednesday at 10/9c. | Investigation Discovery | Facebook
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1.2K reactions · 166 shares | When a surveillance tape shows someone setting fire to David’s SUV, investigators think it may lead them to his killer. Watch the all new season premiere of On the Case with Paula Zahn, TONIGHT 10/9c only on Investigation Discovery. | Investigation Discovery | Facebook
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189 shares · 36 comments | John Walsh is BACK tonight at 10/9c and he needs your help more than ever to capture more dangerous fugitives like Leroy Headley. | Investigation Discovery | Facebook
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A disturbing partnership that led to unimaginable abuse. Ruby & Jodi: A Cult of Sin and Influence premieres Monday at 9/8c on ID. | Investigation Discovery
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