A man who bashed a Perth grandfather, who later died from his injuries, has been sentenced to life in prison with a minimum of 23 years.

Quade Karsum Jones, 29, attacked Emilio Lombardi outside his East Cannington home after the elderly man went outside to investigate a disturbance on August 16 last year.

Mr Lombardi, 84, died in hospital two weeks after the assault.

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Graphic images Mr Lombardi's injuries were later shared by WA Police.

Jones, from Seville Grove, bashed Mr Lombardi during a day-long crime spree, with officers called to the area after a string of random attacks on strangers.

The incidents included the assault of a woman in her 40s, a man in his 20s being punched and robbed, and a woman in her 20s being hit with a metal sign.

Jones had pleaded guilty to Mr Lombardi's murder and other assault offences.

He claims to have no memory of the attacks.

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