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Re:Kim Wall: Headless body identified as missing journalist by tyingq on Wednesday August 23, 2017 @08:33AM (#15080944)
He was apparently very contentious about the submarine and his history with others involved in it as well.

I could see an escalating scenario where she, as a reporter would, started questioning around that topic. She hits the right buttons, and he loses it and injures her badly enough that he now has to make a decision.

Re:Kim Wall: Headless body identified as missing journalist by pvaldes on Wednesday August 23, 2017 @12:12PM (#15082703)
Sounds like a reasonable hypothesis to me, taking in mind the many sources talking about his short-tempered character.