Blood matched Allison Baden-Clay’s DNA

AAP A scientist (pic) says Allison Baden-Clay's DNA was found in a car she and her husband owned.

How many times? How were hotels paid for? Do you regret the whole thing or just being caught?

These were some of the questions running through Brisbane mother Allison Baden-Clay's mind in the days before she disappeared, according to court evidence.

Pages from the 43-year-old's diary were shown to the jury in her husband Gerard's murder trial, as it draws to a close.

The final diary entry was dated April 18, 2012, just two days before Baden-Clay reported his wife missing.

The entry, a long list of crossed-out questions and statements, shows her husband's three-and-a-half-year affair with his former colleague Toni McHugh was playing heavily on her mind.

"How many people in the office knew?" was one question.

"Were you prepared to live with the guilt if I hadn't found out?" was another.

The mother of three also wrote: "Really hurt - had so many opportunities to tell me", and "Let me believe it was all my fault".

The diary entry ended with: "Find whole thing dirty - maybe I'm prudent(sic)? Still get sick in stomach".

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Blood matched Allison Baden-Clay's DNA