Kid Rock's Assistant Killed in ATV Accident

7:00 AM PST -- Kid Rock says Sacha was "a member of our family and one of the greatest young men I have ever had the pleasure to not only work with, but also to become friends with."

He adds that he's going to stay in Nashville until he can bring Sacha home to his family.

Kid Rock found his personal assistant dead from what appears to be a late night ATV accident on the grounds of the singer's Nashville home.

Cops say Kid and a friend called 911 Monday around 11:30 AM once they found Michael Sacha on an embankment near Kid's driveway. Sacha was last seen around midnight when he used the ATV to drive 2 people to the street to meet an Uber ... according to police.

Kid didn't notice Sacha was missing until Monday morning and went looking for him. Police say it appears Sacha wrecked on his way back to the house ... where Kid had a cookout on Sunday.