Police are continuing to question three teenagers over the murder of a surgeon outside his home.
Anthony Owen, 68, was found by two members of the public lying next to his white Honda Civic in affluent Hale Village in Widnes, Cheshire.
Police were called to Hale Road at around 10.20pm on March 11 and Owen was taken to the Walton Centre for Neurology and Neurosurgery with serious head injuries. He died in hospital six days later.
Cheshire Police said three teenagers, aged 14, 16 and 17, all from Widnes, were arrested yesterday and remained in custody.
Officers were alerted to the incident by a passing motorist who told detectives he saw three males on bikes shortly before he found Owen.
Police said two of the males rode BMX bikes, with the third balanced on the back of one of the bikes.
Detectives ruled out the possibility that Owen had been hit by a car but said they were still investigating what happened.
According to reports Owen was a semi-retired cancer surgeon who did locum work at Wrexham Maelor Hospital in North Wales.
Anyone with any information in relation to the incident is urged to call Cheshire Police on 101 quoting incident number 973 of March 11.
Information can also be passed on anonymously, via Crimestoppers, on 0800 555111.