Businesswoman Diana Lee, 54, was bludgeoned to death at her home in affluent East Cheshire by her debt-ridden boyfriend David Ryan, a trial at Chester Crown Court heard.
Ryan, 48, of Byrom Street, Altrincham, spent the cash he stole from Ms Lee on IVF treatment for his wife and a list of other luxuries.
He denied murder but was found guilty by a jury of six men and six women after a seven-week trial.
The divorcee's naked body was found face-down and mutilated in a wheelbarrow full of wood by firefighters who were called to attend a blaze at her gated detached property in the leafy village of Cranage, near Holmes Chapel, on August 9 last year.
Ms Lee - the owner of a "luxury cattery" - suffered fatal head wounds from "a sustained attack with a blunt object" and was mutilated by Ryan in an attempt to get rid of DNA evidence.
Ryan, with greying, shoulder-length hair and wearing a grey suit, shirt and striped tie, gave no reaction as the sentence was handed down by Mr Justice Henriques.
As he was led from the dock to the cells, the victim's brother, who had been in tears for much of the sentencing hearing, shouted: "Evil scum."