>> this was a relatively contained crime seen. a lot of impact blood spattered. >> gardner carefully examined everything the doctor had been wearing that morning. a lot of the blood on his clothing could be explained by his attempt to administer cpr. but the expert looked at hamilton's shoes, the left one in particular, and found that to be a different matter. the shoes were found next to susan's body. john said they fell off his feet as he was attempting to revive her. the expert believed whoever was wearing the shoes that day was present when susan hamilton was being bludgeoned to death. >> effectively the inside and front of the shoe was in motion around this spatter event for mr. hamilton that's radiating out, and the only explanation of that event is the wounding to mrs. hamilton. >> and then there were these