John Kelly, a criminal profiler and psychotherapist, and Jason Jensen, a private investigator, also called Laundrie's version of events 'farcical.'
And, even if he did kill Petito out of mercy: 'Euthanasia is not legal in any state, anywhere. Euthanasia is murder.'
Kelly also told FOX News that he was frustrated that Laundrie 'tiptoed around the confession.
'He wanted to serve it up as a mercy killing.
'That's the thing that's bugging me more than anything,' Kelly said. 'He found her breathing heavily and gasping for breath, so he decided to choke her out?'
He continued to say that it made no sense that he would strangle Petito on the spot rather than drag her back to their van to get some help.
'I don't believe in all this accident stuff, because how can you say you love somebody so much, you can't go on without her, you love her so much you're willing to commit suicide like a Romeo and Juliet?
'She's hurt, and will not go and get help for her.
'And not only will you not go the extra mile,' he said, 'you will not even report her missing.'
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Jensen also said he found Laundrie's story suspect, saying: 'He writes this farcical tale about her falling down and getting injured while crossing Spread Creek, and describes how he couldn't leave here behind.'
He called the notebook passage 'an attempt to rewrite history.'
'The truth is he killed her because he was a domestic abuser,' Jensen said. 'He strangled her, and had done so before.'
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'The only thing I give him credit for, in any way, is he decided to get eaten up by animals himself,' Kelly said.
Two of America's top medical examiners have called into question Brian Laundrie's claims that he killed Gabby Petito out of mercy after she was suffering from hypothermia.
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