Netflix has released four new true crime documentaries with compelling footage and interviews.'Cold Case: The Tylenol Murders' delves into the 1982 case where seven people died after Tylenol bottles were poisoned with cyanide.'Oklahoma City Bombing: American Terror' revisits the 1995 domestic terror attack that killed 168 and injured over 600 people.'A Deadly American Marriage' covers the 2015 death of Irish widow Jason Corbett and the investigation into his murder.'Fred and Rose West: A British Horror Story' explores the chilling story of one of the UK's most notorious serial killer couples.