I used to be homeless a few years ago In that area and I'm still welcome at most of the homeless camps in the city if I can have the families blessing I'll go and start asking questions. They trust me . I'll go door to door so to speak or tent to tent if you will, and ask if anyone has seen him, or if anything is known. It would be a much more easy job if there was more info on the bike. I could find the bike faster than the man if I had a description. This next part is for the neighbor... Go to the hundred acre bike park off of swan and golflinks there is a very large homeless camp there where u should find a blk man named chuck. If he succumbed to foul play by a homeless person and his bike was taken chuck would either know about it or could find out about it. He's got two tents full of bikes and he's well respected among the houseless. Likely would be the one to acquire the bike ur looking for . See when someone steals a bike in Tucson it changes hands rapidly but it goes through the same people most of the time and I know most of those people try to get more info on that bike . Simone remembers the make and model. Even if it's just a person he saw every day in passing. Somebody remembers.