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When she got dolled up, oh my god, gorgeous. Did she write these letters . Was this a hint to who killed her . This is a message saying this is my killer. Like you would see in a movie. And the ending, that was just like a movie, too. I cant believe what people do to each other. Hello, and welcome to dateline. Roc, in this case, those three letters would tell a story all their own. When Karen Pannell was found murdered in her South Florida home, the letters scrawled in blood above her body seemed like a beacon that could lead detectives to her killer. But what exactly did they mean . What othe...

scene. >> you can almost recreate the crime. >> right there on the wall, a mystery scrawled in blood. three cryptic letters. what would you make of this? >> is that a word? is that a person? >> the clues pointed to so many directions that it was a total mystery. >> the case, the murder of a former model and flight attendant. >> when she got dolled up, oh my god, gorgeous. >> did she write these letters? was this a hint to who killed her? >> this is a message saying this is my killer. >> like you would see in a movie. >> and the ending, that was just like a movie, too. >> i can't beli...

>> you can almost recreate the crime. >> right there on the wall, a mystery scrawled in blood. three cryptic letters. what would you make of this? >> is that a word? is that a person? >> the clues pointed to so many directions that it was a total mystery. >> the case, the murder of a former model and flight attendant. >> when she got dolled up, oh my god, gorgeous. >> did she write these letters? was this a hint to who killed her? >> this is a message saying this is my killer. >> like you would see in a movie. >> and the ending, that was just like a movie, too. >> i can't believe wha...

It into your lab? >> yes. i have to look at those letters, everything about them. >> using a high powered microscope, she did an analysis of the specks of blood that stained the wall as karen was stabbed 16 times. that blood splatter served as a gruesome canvass with roc written over it. >> when the letters of roc was written on top of it. it scanned right over it and didn't disrupt at all. >> here was her specialization, roc must have been written after they dried, how long after? >> i have a special machine i used to make some spatter. >> in her lab, she used animal blood to test how long it...

That blood splatter served as a gruesome canvass with roc written over it. >> when the letters of roc was written on top of it. it scanned right over it and didn't disrupt at all. >> here was her specialization, roc must have been written after they dried, how long after? >> i have a special machine i used to make some spatter. >> in her lab, she used animal blood to test how long it took for blood spatter to dry on a similar surface. >> when i came back and was able to apply spatter to some sections of some cardboard, i was able to get some blood and writing the word roc. i must have written ...