I would suggest that his reason for sleeping under a bridge wasn’t to save money but to hide, sound like it didn’t work.
My first thought was the victim was on the run and hiding. But then again there are so many down and outs now, who knows. Under bridges are a favorite spot for the homeless and the down and out. Not many details in this story. Again, It could have been anyone. This guy just does not appear to be someone who’d pop up on the cartel radar.