There's scant information available in the public domain. I was hoping to watch Bryan Bruce's documentary on the case but have been unable to obtain.
It looks as though he's put his Tamihere Doco behind a paywall.
https://bryanbruce.substack.com/I see he subscribes to the theory of Tamihere having an accomplice (a theory I now believe in) because of the injuries Hoglin sustained. It certainly makes sense, its baffling how Tamihere could have acted alone.
I now live in a locality not far from Thames/ Coromandel. I was chatting to an acquaintance (who I'll refer to as Dave) I've recently made, the Swedish murders came up in conversation.
Dave is in his mid 60s and lived in the area all his life. He said it's common knowledge among some locals that Tamihere had an accomplice, even telling me who he is. A well-known resident of a nearby town between where we live & Thames. Dave said on numerous occasions people have said to this guy
'we all know you were Tamihere's accomplice', to which he just grins back without denial.