The 51-year-old said all the “pieces of the jigsaw” pointing to his guilt can be explained and said it “hurts my heart” to be accused of killing Pamela Jackson.
Under cross-examination at his murder trial, Muir accused prosecutor Andrew Robertson QC of “having a good imagination” and told him he “would have made a good novellist”.
But Mr Robertson said all the evidence put together proved Muir had murdered the 55-year-old gran.
The QC asked Muir about the soil found in his car which was similar to soil in Pamela’s moorland grave, his fingerprint being on a carrier bag in the grave, the phone evidence placing him on the moors on the night he allegedly buried her, his recordings apparently confessing to a violent incident that day and her blood being found in his car.
Mr Robertson asked: “Are all these unfortunate coincidences or are you saying you’ve been set up?”
Muir replied: “A bit of both I think.”
Asked if he had returned to Pamela’s home five days after the alleged murder to clean up blood, Muir replied: “Here you go again. You should be a book writer because you would have made a good novellist. I don’t know where you get these theories from.”
Mr Robertson also accused Muir of going on Pamela’s Facebook account the same day at her home in Chester-le Street, to give the impression she was still alive. Muir replied: “Here you go again. I should just have a tape recording which I can press saying “No Mr Robertson.”
In a later exchange he denied trying to make it look like Pamela was still alive.
Muir, who denies murder, said he had taken her to a pub near where she was buried, on a previous occasion. The trial continues.