The grandson of an elderly woman who was raped twice in her Melbourne home more than 40 years ago has described his “disgust” for her attacker, as police narrow their search for him decades on.

Detectives from the sexual crime squad this morning said DNA technology advances and tips received in recent years led them to believe the rapist lived near Jessie Grace Lauder’s home in Mason Street, Newport, when he sexually assaulted her twice in the 1980s.

Ms Lauder died in 1993 without ever seeing justice but police, who’ve offered a reward of $500,000 for information, said they believed the crime could be solved and urged the public to help bring him to justice.

Police believe the rapist lived near Jessie Grace Lauder’s home in Mason Street, Newport, when he sexually assaulted her twice in the 1980s. (Victoria Police)

Sexual Crime Squad Detective Inspector Mark Burnett said the attacks on the defenceless widow were “right up there with the worst level of offending that I’ve seen”.

“Though Jessie is sadly no longer alive, these brutal attacks have had enduring effects on her family,” Sexual Crime Squad Detective Inspector Mark Burnett said. 

“Jessie was a vulnerable older woman who should have been safe in her own home.

“On the other hand, this man has lived these last 40 years with relative freedom and no repercussions yet for what he did.”

Ms Lauder’s grandson Malcolm Lauder became emotional today as he told reporters of the trauma that has plagued the family for decades.

“She’s five foot nothing, my grandma, five foot nothing,” Mr Lauder said.

“And somebody has gone into the sanctuary of her own home where she should be the most protected that she should ever feel.”

Mrs Lauder's grandson Malcolm Lauder became emotional today as he told reporters of the trauma that has plagued the family for decades.
Ms Lauder’s grandson Malcolm Lauder became emotional today as he told reporters of the trauma that has plagued the family for decades. (Nine)

Police said Ms Lauder was sexually assaulted twice in her home – where she’d lived for 55 years — first in September 1981 and again in July 1983, when the attacker referenced the earlier assault and warned her not to go to police.

”You can’t get away with this brutality, this lack of respect,” Mr Lauder said.

“I just cannot, I cannot express the disgust I have for this person.”

The 82-year-old, who was widowed in 1977, was in bed when a man forced entry about 10pm on September 22, 1981, and entered her bedroom armed with a knife.

Police said he sexually assaulted her in another room and looked through her purse for money before climbing over the back fence into a vacant lot on Oxford Street.

Jessie Grace Lauder was 82 when the man first attacked. (Supplied)
Jessie Grace Lauder was 82 when the man first attacked. (Supplied)
He demanded $10 and allegedly threatened to return “every week”, police said during an earlier appeal for information, in 2016, which they said prompted a lot of useful information.

It’s believed the same man returned on July 6, 1983, forcing his way in through the front door, taking Ms Lauder to the kitchen to check no one else was home and then back to the lounge room to sexually assault her.

“During the second incident the man made reference to the earlier offence and warned Jessie not to call police,” police said this morning.

Police said Mrs Lauder was sexually assaulted twice in her home – where she'd lived for 55 years — first in September 1981 and again in July 1983
Police said Ms Lauder was sexually assaulted twice in her home – where she’d lived for 55 years — first in September 1981 and again in July 1983 (Nine)

“During the incidents the offender is believed to have worn gloves, a beanie, work boots and items over his face to conceal his identity.”

But police said DNA technology advances and information received after the reward was first offered in 2016 had helped them narrow their search.

They described the rapist as 20 to 30 years old at the time and 175 centimetres tall with a fair complexion, dark hair and Australian accent.

The man might have lived on Mason, Johnston or Oxford streets or the neighbouring Lucius and Cunningham lanes, they said, urging anyone who may have known him to come forward.

“It is as important as ever that the person responsible is brought to justice and I absolutely believe that with the right information, it can be solved. If someone has knowledge of this and has lived with it for over forty years, now is the time to come forward,” Burnett said.

“Historical investigations are unique in that updates to science, methodology and legislation allow us to progress a case in a way that may not have been possible at the time of the incident, so receiving information even over 40 years later can still make an enormous difference.”

Police said the award would be paid “at the discretion of the Chief Commissioner of Police for information leading to the apprehension and subsequent conviction of the person or persons responsible for the aggravated rape and rape”.

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