Robert Craig, 81, was found guilty in July of killing 86 year old Leo Corriveau.
Officials said Craig and Corriveau were neighbors in Florida and Craig had come up to Maine for a visit in July of 2016.
They got into a fight after Corriveau refused to help Craig pay for his return trip and Corriveau was strangled and left in his yard.
Craig was eventually arrested in Florida and claimed he was simply protecting himself.
He'll receive his sentence Tuesday and his attorney's said they plan to appeal the verdict.