How long was he on the phone? Cell phone records could be used in court, along with the testimony of the person he was talking with.
If none of the witnesses say the man they saw was on a cellphone, and the timeline of the call runs into the timeline of the witnesses, then their testomony would be questionable.
Sounds like if he covers his tracks on where he was and when, he will be out of this in no time.
bump
Go look for security cameras, ring doorbells, etc.