henthorn was charged with the murder of second wife , toni bertolet , 51 , last november and police have since reopened their investigation into the suspicious death of his first wife some 20 years earlier .
both women died in ` freak accidents ' to which henthorn , 59 , was the sole witness .
dr toni jill bertolet plunged 140 ft to her death shortly before their 12th wedding anniversary while changing a flat tire in the dark .