A 59-year-old alcoholic virgin who raped a teen girl at knife-point as she walked home from school has been sentenced to more than eight years in prison for his horrifying attack.

Christopher James Bahen, who was 58 at the time of the attack, chased down his 17-year-old victim last September in Melbourne's east, and held a knife to her throat as he raped her.

County Court judge Mark Gamble described the attack as chilling and said it was like 'something out of a horror film' as he handed down the sentence.

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59-year-old alcoholic virgin Christopher James Bahen, who raped a teen girl at knife-point as she walked home from school, has been sentenced to a minimum of six years in prison for his horrifying attack. CCTV footage captured him leaving the scene of the attack last year

Bahen planned his brutal attack for more than a week, mapping out the area and secretly filming school girls walking past his house, zooming in on their legs and skirts.

CCTV footage shown to the caught captured the terrifying moment Bahen chased his victim, who was walking home from school in her uniform with earphones in, according to AAP.

Bahen attacked the girl just metres from the road in front of witnesses just after 4pm.

When she shouted 'help me, help me', Bahen threatened to kill the girl.

The Supreme Court heard Bahen used a knife to threaten the young girl before digitally raping her on a nature strip while he told her she was a 'dirty little whore' and who 'deserved it'

He also called the teen girl a 'slut', 'whore', and 'c***' during the attack, the court was told.

The court was also told Bahen's breath smelt of alcohol after he had been drinking for three days, and that his victim thought she was going to die and 'hated the person (she had) become' since the attack.

Judge Gamble added the victim thinks about what would have happened to her if witnesses hadn't intervened and she is haunted by visions of the blade and the blood pouring from it.

The attack took place as the teen walked past a nature strip on her way home from school in Ringwood

He praised the victim, saying she bravely fought a man who was bigger and stronger than her and tried to raise the alarm

'It is even sadder that she initially felt a sense of shame and embarrassment for what had happened,' Judge Gamble said.

'It is you, Mr Bahen, who should feel responsible, embarrassed and ashamed for what occurred.

'It was a most despicable act on your part.

Police followed a trail of blood around the corner which led them to Bahen's apartment

'Perhaps worst of all you suggested she was some how to blame for it, saying she deserved everything she was getting.'

Additional footage shows Bahen flee the scene minutes after the attack. Two men who were driving past witnessed the hideous assault and called police.

Officers then followed a trail of blood from the scene back to Bahen's house, where they arrested him.