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A polygraph and had, in fact, paid money to download a book on how to beat it. >> as testing continued on the blood stains on the floor of the crime scene, investigators noticed one blood drop on darrell north's pants that they had previously overlooked. >> there was a vertical drop on the back left pant leg of darrell north, while he's laying on the floor. >> the shape of the drop was perfectly round, meaning that the origin of the blood was stationary, and hit the fabric at a 90-degree angle. >> the significance of such a drop falling and hitting the pants perpendicularly while mr. north is ...

Darrell may have used it to defend himself, causing an injury, a facial cut, or nosebleed. to identify the killer, dna samples were collected from the two suspects, bob johnson and curtis pope. dna testing revealed it was curtis pope's blood at the crime scene. >> if darrell north had not taken some steps to defend himself, this case wouldn't have been solved. >> would have never dreamed that, you know, firing somebody, you know, would cause somebody to, you know, go postal. >> darrell's family couldn't believe that the man whom darrell had mentored in business and treated in many ways like a ...

Investigators found five other drops of blood at the scene perfectly round in between darrell's body and the door. >> i said, why not let's just test these five particular drops of blood that we know or we feel like didn't come from darrell north. >> tests confirmed the blood was not darrell north's. there was only one question that remained. who left the blood? one of the two suspects or someone else? beta-glucan... of a soluable fiber from whole grain oat foods like cheerios can help lower cholesterol. thank you!

Going to continue to work there because, according to him, darrell had promised him continued work. >> darrell's family never met johnson, but they'd heard of him. >> darrell had mentioned that he had had some problems with him. he usually didn't bring his problems home, and so since it was something that he had shared with me, i thought it was probably serious. >> incredibly, just two days after darrell's murder, johnson called asking to get his job back. >> the superintendent felt like it was odd that bob johnson was calling there, when can i come to work, after the fact, after darrell's bee...

He wanted to own divas when he walked in there. and he is just a small little man and perhaps the most incompetent killer that bucks county's ever seen. up next, a violent thunderstorm provides cover for a brutal murder. >> an absolutely brutal crime scene. >> obviously, this was a case of an overkill. >> there are plenty of suspects with clear motives, but they all pass polygraph tests. >> it's not 100% reliable. >> if investigators didn't find the one tiny clue left at the scene, they might never have solved it. the real estate development business in texas always seems to be active. dar...