Music shop owner, Tanveer Iqbal had been missing since Sunday evening after closing his shop, Hi-Tech Music in Birmingham.
Following urgent police enquiries, the 33-year-old was found dead on Monday afternoon in the boot of his Renault Clio.
The car was parked on a residential road in Edgbaston, less than a mile away from Mr Iqbal’s shop.
His death is being treated as suspicious but West Midlands Police have not announced a cause.
Detective Inspector Paul Joyce is leading the investigation, said: “We’re working around the clock to try and piece together events leading up to this man’s death.
“If anyone has any information which they think may assist me with this investigation, I would urge them to get in touch as soon as they can.
“I am particularly keen to speak to any witnesses who may have seen Mr Iqbal between closing his shop in Smethwick on Sunday night and the time he was discovered at lunchtime on Monday.”
Portland Road remained closed as forensic examinations continued today and the vehicle has been removed from the scene.
Mr Iqbal’s family is being supported by specially trained officers and a post-mortem was due to take place this afternoon.
Anyone with information is asked to call police on 101 or the independent charity, Crimestoppers, on 0800 555 111.