Jason Smith, charged with the slaying of a Center City pediatrician, had a relatively clean record. Wayne Welsh, a criminal-justice professor at Temple, said this is "extremely unusual." "Usually when you're talking about somebody who has the capacity to commit that kind of violent murder, it would be extremely unusual if we don't find anything in his history indicating aggressive and violent behavior," Welsh said. "I'd be shocked if that history doesn't start to come up, even if it's not some type of criminal history."