Police have named a man who was found shot dead in his car on a country lane.
Jordan Matthew Banton, 23, from Rugby, was found in a car on Newton Road near Rugby at around 11.40am on Friday.
Post-mortem tests have revealed the cause of death to be a shotgun wound to the head, Warwickshire Police said.
Detectives are continuing to follow a number of lines of enquiry and a number of warrants are being executed in the Rugby area.
A 19-year-old man arrested on suspicion of murder remains in police custody.
Two more men in their 30s who were arrested on suspicion of conspiracy to commit murder have been released on bail while a woman was released without any further action.
It comes as police examine a silver Vauxhall Insignia which police believe was used by the gunman.
The car was found by a member of the public in the Hilmorton area of Rugby at around 7pm yesterday just hours after police issued a picture of the vehicle.
A force spokesman said Mr Banton's family have been kept fully updated in relation to the ongoing investigation and specially trained officers are providing support.
Superintendent Adrian McGee said: "A huge thank you to everyone who took note of our appeal, passed the word around, retweeted or shared our posts on social media.
"This only goes to show the value and importance the public play in assisting police with these large and complex enquiries.
"The vehicle will now be forensically examined and we hope will provide another piece in the jigsaw towards understanding exactly how Jordan Banton was killed."