A leading victim support campaigner has called for a minimum 25-year sentence for the killers of people who die protecting their own property.
Norman Brennan, director of the Victims of Crime Trust, said "ineffective" sentences were not protecting victims like farmer Michael Boffey who was run over and killed by a car thief on Saturday.
Mr Boffey received fatal head injuries as he tried to stop an offender escaping in a Land Rover stolen from his Warwickshire farm.
Mr Brennan said it was time judges sent a "strong deterrent message" that criminals would serve 25 years in jail for committing such murders.
He said: "Criminals often commit crimes such as theft of motor vehicles and will not think twice about running over and killing anyone who gets in their way, knowing that the law is so ineffective that if they are unlucky enough to be caught and convicted that sentence will be so short that it acts as no deterrent to anyone at all.
"With home and vehicle owners losing their lives whilst trying to prevent losing their belongings, the question has to be asked how many people have to die before our criminal justice system sends out a strong deterrent message that such killings will attract a minimum sentence of 25 years."
Mr Boffey, aged 61, had left the keys in the ignition of the green Land Rover Defender while he was in offices at Grange Farm at Withybrook, near Rugby.
Mr Boffey, who lived in Burton Hastings, near Nuneaton, is thought to have been trying to block off a gateway when he was struck by the vehicle.
The Land Rover was abandoned in the car park of St John the Baptist Church in Wolvey, which is some three miles from the farm, about 30 minutes after the incident.
The car thief is described as a white man, aged between 25 and 29, stocky, with short, unkempt hair.
He was wearing a pink or red T-shirt, which may have had writing on it, and a sleeveless green or brown jacket.
The second man, who was seen in a silver saloon car, is also described as white, aged between 25 and 29, with short, dark, unkempt hair but with a darker complexion.