Other than why let some random tie you naked to his bed in some seedy low-rent flophouse? (I understand it happens), there are four specific things that make me wonder whether they'd known each other a while. First, the victim's apparent loneliness and sense of disconnection may have made him more inclined to get involved with someone who was a little (or a lot) off and rationalize it -- especially if that person was a "local;" second, third and fourth, there have been some reports that (1) they were "together" and that LJ found a new bf thereby p*ssing lm off; (2) that lm had previously lived in an apt. closer to LJ's apt. and the store where he worked and may have met him that way; and (3) also one report (totally unsubstantiated afaik) that LJ lived in the same apt as lm. In my mind, the last report may have been an erroneous statement based on LJ coming and going frequently rather than actually living there. Oh, and maybe a 5th thing. The head in the park. Maybe they had been there together before for certain purposes or in different circumstances. I don't truly believe this last thing myself, but anything is possible. So, jmo, I think they knew each other for a period of time. I'd guess 6-8 weeks.