Robert Dolby, 74, was described as a sex-obsessed narcissist with a Jekyll and Hyde double personality during his trial this week in the Mediterranean city of Nice.
The former chef, who retired to the sun-soaked south of France in 2005, was in 1991 sentenced to four years in prison in the UK for sexually assaulting a colleague he invited to dinner.
Cindy said she met what she believed to be a lonely, childless pensioner in a bar in Monaco.
She was looking for accommodation and he offered to let her share his home in the town of Beausoleil in France bordering the principality.
Also Read
Cindy has told the court that his "paternal, protective" side quickly became overwhelming, and led to him declaring his love for her and a violent middle-of-the-night attack in which she was digitally penetrated and strangled near to death.
Her death was declared natural as a result of a heart attack, but an emergency services worker raised concerns over Dolby's calm state of mind after she died, lipstick stains on two cushions, and a blue tinge to her partially naked body.
Chevalier's body was exhumed after the attack on Cindy and traces of a powerful sleeping drug Zolpidem were found in her system, the court heard. An expert said the levels found indicated she had ingested it after arriving at Dolby's house.
A psychiatrist separately testified that he displayed signs of "narcissistic perversion", capable of throwing out "seductive hooks" while at the same time being "emotionally anaesthetised, very cold.