Keeping a lot of the incriminating evidence on him (including, it seems, the jacket) can't be a careless mistake (in my opinion). So what are some of the possible reasons? - He committed the crime and had another target in mind - He committed the crime and really didn't think he'd get away with it so he kept it to keep some unknown options open. - He committed the crime and didn't want any doubt that he was guilty wh…
Seems pretty likely that this was the case. Getting away from the site of the crime is challenging enough!