How can I get different endings?

Hint 1 of 10:

Yes, there is.

Hint 2 of 10:

First off, once you show Baxter and Dunbar the evidence, don't arrest them.

Hint 3 of 10:

Try arresting them separately.

Hint 4 of 10:

Or, wait a little bit.

Hint 5 of 10:

After a certain time, go to Ms. Dunbar's room.

Hint 6 of 10:

She should be lying dead on the floor, and if you're there at the right time,
Baxter should be there.

Hint 7 of 10:

You can arrest Baxter now, but you still don't know if Dunbar commited
suicide or if she was murdered.

Hint 8 of 10:

So, look at the note.

Hint 9 of 10:

This is a tough one.  You have to prove that she wasn't the one who wrote the
know.

Hint 10 of 10:

Ask Baxter for a pen.