What does Madsen say about:

  * What happened while the two were at the submarine?
  * What did he do after he supposedly left her at a restaurante?
  * Why did he changed his story?
  * How did she die?

Did the journalist had any special information/characteristics/secret agenda that could have caused Madsen to kill her and destroy his own life in that way?

What was happening in the life of this Madsen recently that could indicate that he was going to do something like that?