Throughout the SeriesEdit
In Unsolvable, after Amy feigns dental problems, Holt arranges for her to go to see Martin Cozner, Kevin's brother, who has agreed to see her as personal favour to him. Despite her protests, Holt takes her to see Martin. Martin does a dental examination on her but tells her that he can't see anything. He is about to look at her x-rays when Amy admits that she lied. She is about to leave when Martin checks her x-rays. He tells her that she has been brushing over aggressively which has stripped the enamel on her teeth and she had seven cavities.
- He is described by Holt as 'one of the top oral surgeons in the quint-state area'.