Show 3 Theories Held in Extortion Threat PASADENA Cal Dec Dee 22 UP UP- UP Three theories were under investigation tion by police today into 3 a threat ol of death for William A A. Baker 57 57 unless he paid His wife was killed December 12 when a bomb demolished demol demol- part of their home and a similar fate was threatened for Baker Police PoUce believed the letter maY may have been written by a crank by the perpetrator perpetrator of ot the explosion or as a means of ot throwing investigators off the trail of ot the bombers The mystery of of- the December 12 explosion has n not t been solved |