Sunderland OAP branded 'monster' by family of child sex abuse victim
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George Porter had led a "productive life without any criminal convictions" until he targeted the girl.
The 74-year-old admitted causing or inciting a child to engage in sexual activity and two sexual assault offences.
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Hide AdAt Newcastle Crown Court he has been jailed for four years with a one year extended licence period.
Porter, of Front Street, Newbottle, Sunderland, must sign the sex offenders register for life and abide by a sexual harm prevention order for five years.
Mr Recorder Carl Gumsley said Porter put the child through a "terrifying and traumatic experience" but his guilty pleas saved her from reliving the ordeal in court.
He added: "What harm this poor child will suffer in due course is probably impossible to say at this stage."
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Hide AdPorter's victim's family attended court for the hearing and read out impact statements on behalf of the youngster.
They said Porter's crimes were "wicked and depraved" and that her life had been "tainted by a monster".
Their statement added: "How do you measure the psychological impact this will have on our little girl.
"He has sentenced her to a lifetime of horrors and flashbacks."
Shaun Routledge, defending, handed in character references and said Porter, who was of "positive good character" has "genuine remorse".