He had suffered a laceration to the skull, bruising of the face and abrasions across his body, Hollingworth said on Tuesday, but authorities were unable to determine a cause of death because Mammone had ice and cannabis in his system and had prior heart problems.
The woman went to police about a month later and was later jailed for armed robbery. McEachran was initially charged with murder, but this year pleaded guilty to manslaughter and armed robbery.
Hollingworth jailed him for nine years and nine months. With two years served since his arrest, the 44-year-old will be in prison for another five years before he is eligible for parole.
The judge said: “Mr Mammone was lured to a remote location in the middle of the night by someone he knew and trusted. Having been tricked into getting out of his car, he was confronted by two offenders who were attempting on taking his car from him.
“He was unarmed and did nothing to start the violence that you [McEachran] influenced on him. Despite Mr Mammone’s resistance, you overpowered him and knocked him to the ground.”
Mammone was a grandfather and a father of three daughters, the court heard. Hollingworth said his family of him “are heartbroken that they will not be able to share the rest of their lives with him”.
McEachran had a disadvantaged childhood, with a violent father, used drugs and alcohol from his teens, left school early and had no work history, the court heard.
He has previous jail time for violent assaults, and Hollingworth said his rehabilitative prospects were poor because he had no family support other than contact with his teenage daughter and former partner.
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