A force spokesperson said: “We are investigating the circumstances of his death and officers remain at the scene.”
They said the vehicle was in the Iceland parking lot, near Poundstretcher and B&M.
Derbyshire Live understands these stores are currently closed while police investigate the death.
In a Facebook post, one person wrote: “Police incident at B&M parking lot, no entry into parking lot or shops. ”
Derbyshire Live has a reporter on-site and we’ll keep you posted when we have more information.