John McGinn, 50, worked as a fireman in North Lanarkshire for 30 years, reports the Daily Mail.
In January 1994, he attended a fire at a house in Bellshill.
McGinn rescued a nine-year-old girl from the blaze; she was taken to stay at her grandmother’s while her mother, who was suffering from smoke inhalation, was taken to hospital.
However McGinn later turned up at the grandmother’s house and pounced on the girl, covering her mouth and raping her.
The victim, now aged 30, told the High Court in Glasgow: “I told him to stop. He said if I told anyone he would kill my mother.”
Magian denied the charges, insisting that he “would rather put a bullet in my own head than be a paedophile”.
However the court heard that around the same time as the rape, McGinn repeatedly assaulted his partner, who had started a relationship with him when she was just a teenager.
Describing McGinn as a “manipulative and controlling monster”, she claimed that he repeatedly raped her from the age of 16 - and only ever consented to sex once.
The ex-firefighter, despite insisting the claims made against him are false, has been found guilty.
Judge Lord Bonomy told him: “You have been found guilty of a monstrous catalogue of physical and sexual abuse of a woman and two young children.
“There is no explanation that could excuse what the jury has found you guilty of. The sentence will inevitably be a lengthy prison sentence.”