Stuart Paul Anderson was found guilty by a jury of the 2019 murder of Vicki Ramadan in her home at Sydenham, in Melbourne's northwest.
The pair met when the widowed Mrs Ramadan knocked on Anderson's door and asked for his help with some odd jobs around her home, including building flat pack furniture.
After her death, he told media in television interviews she seemed like a lovely lady and he hoped "the cops catch the son of a b****" who did it.
But it was Anderson who killed Mrs Ramadan, between March 23 and 25, 2019, after witness accounts said they heard multiple arguments between the pair.
There were signs of life until lunchtime on March 25, including a call from one of her phones to another and an electricity spike consistent with a hotplate, and then nothing.
The 77-year-old was found dead inside her home from 13 blows by a torch, including four to the right side of her skull.
Anderson's denials continued on Friday during a pre-sentence hearing at the Supreme Court in Melbourne, where Justice Amanda Fox noted his lack of remorse over the killing.
"There is no remorse," she said.
"Quite so," Anderson's barrister Tim Marsh replied.
Mr Marsh said Anderson was not callous or indifferent to Mrs Ramadan's death, but the judge attributed his reaction to Anderson's belief that he was innocent.
"Anderson is aggrieved because people think he is capable of doing this," Mr Marsh said.
"His explanation is, 'I find this distressing because I didn't do it'," Justice Fox said.
Prosecutor Neill Hutton said the crime was a serious example of a murder in the context of a burglary gone wrong.
He said Anderson's victim was particularly vulnerable.
"She is not merely vulnerable because she was the age that she was, but also because she had health concerns," Mr Hutton said.
"It's common ground that an assault that occurs in somebody's home is something that violates a very primal and significant belief in safety (and), on any assessment, this was a savage assault."
Anderson was convicted by a jury in his third trial, as one jury was discharged after being unable to reach a verdict and the second was discontinued before deliberations were reached.
The court was told Mrs Ramadan was known for wearing lots of jewellery, which was found alongside cash in her home after she was killed.
Anderson will be sentenced at a later date.