Kid Rock's Assistant Severe Blow to Head in ATV Death

4/26/2016 9:32 AM PDT

Emergency Responders: Kid Rock's Assistant Suffered Severe Blow to Head in ATV Fatality

EXCLUSIVE

Kid Rock's assistant, Michael Sacha, suffered horrific head injuries in the fatal ATV accident at the singer's Nashville home ... according to emergency responders.

TMZ obtained the audio of the fire department dispatch ... as paramedics raced to the scene on Monday morning. The dispatch operator describes Sacha's injuries and says the 911 caller "thinks [Michael]'s beyond any help."

As we reported ... Kid Rock and a friend called 911 when they found Sacha face down in an embankment off Kid's driveway.