convinced that alvin latham's taped confession had been coerced. but why did the coroner rule tinky's death a homicide? in looking at the autopsy findings, barbee discovered the coroner did not know the depth of the so-called knife wounds. >> the coroner never measured them, never dissected them, never checked them for the angle. >> from the photographs, dr. cyril wecht, an independent forensic pathologist, didn't believe these were stab wounds at all. >> expect all or at least some of the wounds to have had some significant depth of penetration. we do not have that in this case. hence, i do not believe that these were stab wounds. >> but if they weren't stab wounds, what were they? >> when you think of a propeller and a portion of it striking some part of the body, then it is easy to understand how you can get these kinds of injuries.