Julie was killed in her Billingham, Teesside, home in 1989 and Dunlop was put on trial for the murder. However, in 1991 a jury at Newcastle Crown Court failed to reach a verdict. A second trial took place after that year but, after a different jury failed to reach a verdict, Dunlop was formally cleared
Dunlop later confessed to killing Julie in the belief that the double jeopardy law prevented him from going back on trial for the murder. He was convicted of perjury, which is lying in court under oath, but no action could be taken in connection with the murder
Launched a petition, which gained 20,000 signatures, regularly appeared in the media seeking support and lobbied MPs for changes
Amendments to the Firearms Act 1968 came into effect, preventing any person who receives a suspended sentence of three months or more, for any offence, from purchasing or possessing a firearm
Every incident of domestic violence, whether or not firearms are involved, should prompt a police review of whether a firearms certificate should continue
Campaign to introduce roadside drugs testing devices, make it a criminal offence to drive under the influence of drugs, have random drug spot checks and give tougher sentences on those found guilty of drug driving
Launched after 14-year-old Lillian Groves was killed outside her home by a speeding motorist who had been smoking cannabis
Natasha and Gary Groves collected more than 22,000 signatures on a petition and met the Prime Minister, David Cameron, at Downing Street
Changes to the law were introduced by the Drug Driving (Specified Limits) (England and Wales) Regulations 2014