I don't believe he did it because so far, nothing makes sense.

He said he drugged her, but there were no drugs in her system, he said he killed her by accident, but she was beaten to death with a cinch around her throat and duct tape on her mouth.

OH, and his ex wife says that he was with her that Christmas.

In Alabama.

And he's just trying to get some attention.. and more than that.. he's trying to get extradited to the US to get out of the trouble he's in in Thailand.