With all due respect, his running means nothing to me. He certainly wouldn't be the first innocent human (if he is, in fact, innocent) who ran away from a crime scene in a state of panic. An American woman has been murdered. Of course he would fear he'd be blamed for it. Due to culture biases, society at large- and I'm sure even many in LE- would rather be able to pin this on some homeless guy than someone who may be more affluent, more "successful". People don't like having to confront the monsters among us- who look, live, work and speak like us- but are capable of unspeakable acts. It's much easier to let our prejudices take over, and accuse the person we least relate to, the person who is (in our own minds) least like us.
I'm not saying he's innocent- but his running away (if he even was at that crime scene) far from proves it.