Corbin Wiederholt , aged months , was shot while in his Elmo , buffalo , playpen . Brother , 5 , was holding a colt .22 caliber revolver when it fired . carpenter 's wife , Alexis , 24 , had no idea the weapon was in her father 's home . Prosecutor said weapon , concealed in headboard , was not in plain sight .
Corbin Wiederholt , 9 months , was shot while in his Elmo , Missouri , playpen . Brother , 5 , was holding a loaded .22 caliber revolver when it fired . Boy 's mother , Alexis , 24 , had no idea the weapon was in her father 's home . Prosecutor said weapon , stored in headboard , was not in plain sight .