I believe I know who the killer is. How do I confront him?
1. Have you gathered enough evidence yet?
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2. When you have, you'll find him eating soup in his room.
(PARTIAL SOLUTION FOLLOWS)
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3. You need to have examined the contents of the evidence locker, and have the golf club cover, the evidence that he's much stronger than he looks, the evidence that Luften doesn't exist and the phone recording.
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4. He still won't confess, though. If only you could do something to make him as honest as Vanessa was.
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5. Have you found Vanessa's truth serum?
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6. It's on the sofa in her room.
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7. Now casually mention it to him and watch him dose himself. You had nothing to do with it.