A woman who was found seriously injured in a car in West Sussex bled to death after being repeatedly stabbed, tests have revealed.
The 27-year-old, who has yet not been named, was discovered in Woodfield Road, Crawley, on Tuesday.
Sussex Police said a post-mortem examination found she bled to death after an artery in her leg was severed.
Two Crawley men, aged 30 and 51, were arrested at the scene.
The 30-year-old, who was arrested on suspicion of murder, has been detained in a secure unit under the Mental Health Act.
Police said the victim and two suspects were known to each other.
'Attacked in car'
Det Ch Insp Nigel Smith, of Sussex Police, said: "This is an intricate investigation and we need to establish the exact circumstances of how this lady died.
"We now know that the attack took place in the car, while three occupants were travelling in it, which then returned to Woodfield Road, from where the ambulance service was called.
"We are advised that the nature of her injury would have resulted in her death in a matter of minutes."
Police said the victim was also stabbed in the body and head.
Emergency services were called to the scene at just after 1800 GMT but paramedics were unable to save the woman and she was pronounced dead at the scene before her body was taken to East Surrey Hospital, Redhill.
The 51-year-old man who was arrested at the scene has been released on bail until 25 January.