That's very interesting, because all the early reportage always mentions that she was found in a pool of her own blood.
I believe she was stabbed, since most articles say that, but here is one I found that doesn’t indicate it...
The woman’s body was found face down on the hotel room floor Wednesday, abrasions on her face and body, and signs of trauma, Guardia said. He said she was clothed.
Asked if she had been asphyxiated, Guardia said he was waiting for autopsy results on the cause of death.
http://www.google.com/hostednews/ap/article/ALeqM5hP65mkhJDnoedFlSx7Qa2IAc18gAD9G3KNEO0
Also, one story I read said that they found his car with date-rape drugs in it. They also found skin under her fingernails.