Horror moment cops gun down blood-soaked killer who decapitated parents & mutilated dog as he belts out Tina Turner

THIS is the terrifying moment a blood-soaked killer starts to sing Tina Turner on the ground after being shot at by cops.

Joseph Gerdvil, 41, was being chased by police after he was accused of decapitating both his parents and mutilating their dog at their home in California.

A blood-soaked killer was caught singing Tina Turner on the ground after being shot by copsO.C Sheriff's Office O.C Sheriff's OfficeThe moment the cop shot Gerdvil for the fourth time as he fell to the...