I was skimming around on the GLP forum today and came across a link someone posted that had a lot of interesting information.
Brian posts his dreams everyday on this site, some of which he says has come true. (I haven't looked into it enough to confirm this for myself but it is definitely not out of the question. I also record my dreams in a dream journal, but mine is private. Some of my dreams have come true. Dreams are powerful. So I will definitely be checking back on this site again.)
Brain has posted, with the permission of Brian Shaeffer's (victim) now-deceased father, scans of some pages of Brian's journal's. They contain poems of a very depressing nature about his girlfriend cheating on him with his best friend.
In my opinion, he sounds almost suicidal. But this does not mean that he could not have been murdered!
Here are a few scans below. The rest can be found at the source link.