FILE - This Aug. 15, 2012 file photo shows Washington Police Chief Cathy Lanier meeting with reporters in Washington. Washington's murder rate was approaching nearly 500 slayings a year in the early 1990s, the annual rate has gradually declined to the point that the city is now on the verge of a once-unthinkable milestone. The number of 2012 killings in the District of Columbia stands at 78 and is on pace to finish lower than 100 for the first time since 1963, police records show. (AP Photo/J. Scott Applewhite, File)
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FILE - This Aug. 15, 2012 file photo shows Washington Police Chief Cathy Lanier meeting with reporters in Washington. Washington's murder rate was approaching nearly 500 slayings a year in the early 1990s, the annual rate has gradually declined to the point that the city is now on the verge of a once-unthinkable milestone. The number of 2012 killings in the District of Columbia stands at 78 and is on pace to finish lower than 100 for the first time since 1963, police records show. (AP Photo/J. Scott Applewhite, File)
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This photo taken Nov. 20, 2012 shows Dr. Samuel Gordon during a group support session for gunshot survivors, in Washington. Washington's murder rate was approaching nearly 500 slayings a year in the early 1990s, the annual rate has gradually declined to the point that the city is now on the verge of a once-unthinkable milestone. The number of 2012 killings in the District of Columbia stands at 78 and is on pace to finish lower than 100 for the first time since 1963, police records show. (AP Photo/Alex Brandon)
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This photo taken Nov. 20, 2012 shows Jordon Cook, right, talking during a group support session for gunshot survivors, in Washington. Washington's murder rate was approaching nearly 500 slayings a year in the early 1990s, the annual rate has gradually declined to the point that the city is now on the verge of a once-unthinkable milestone. The number of 2012 killings in the District of Columbia stands at 78 and is on pace to finish lower than 100 for the first time since 1963, police records show. (AP Photo/Alex Brandon)
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This photo taken Nov. 20, 2012 shows Ismail Watkins listening during a group support session for gunshot survivors, in Washington. Washington's murder rate was approaching nearly 500 slayings a year in the early 1990s, the annual rate has gradually declined to the point that the city is now on the verge of a once-unthinkable milestone. The number of 2012 killings in the District of Columbia stands at 78 and is on pace to finish lower than 100 for the first time since 1963, police records show. (AP Photo/Alex Brandon)
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Susan Winburn was last seen shopping at the Erindale Chemist on the night of the murder.
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Police are offering a reward for information regarding the 2009 murder of WA man Robert Dalliston.
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Liza Harvey says after the laws were introduced, assaults against police dropped.
Reward to help solve 30yo NSW murder
The mystery murder of Elizabeth Dixon three decades ago was carried out by a violent, impulsive offender who needed "control" and is still on the run, NSW police believe.
Detectives from the Northern Region Unsolved Homicide Team on Monday welcomed the state government's announcement of a $150,000 reward for information that helps solve the brutal stabbing.
The body of 31-year-old Betty Dixon was found in her car in bushland at Ashtonfield, near Newcastle, on April 6, 1982.
Medical examinations carried out at the time showed Ms Dixon, a receptionist who loved playing squash, had been stabbed numerous times and died over the previous three days.
The murder weapon was never found.
Detective Sergeant Stephen Davis said the killer probably knew Ms Dixon, and might have lived near her.
"Detectives also believe that the level of violence shown could be indicative of a person who has anger control issues," he said on Monday.
"The binding of the hands may indicate a need for control.
"The offender may be someone who is reluctant to engage within the general community and may respond impulsively and violently to conflict."
During the investigation in the 1980s, police interviewed a number of people who had a connection to Ms Dixon or her residence, or had been charged with serious offences of a violent or sexual nature around the time of the stabbing.
Detectives attached to Strike Force Wickfield now want to re-interview those people and other witnesses.
"We are also reviewing information from a member of the public who saw a male leaving the same bushland area during the time frame we believe Ms Dixon was killed," Det Sgt Davis said.
Officers are also looking for Ms Dixon's purse, which was never recovered.
Anyone with information can call Crime Stoppers on 1800 333 000.
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