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This is the hero dog walker who battered a Pokemon Go pervert in Sefton Park .

Greg Ollerton, 33, saved terrified teenage girls playing the popular mobile game from aggressive sex-pest Karl Hoey.

Hoey targeted the 15 and 16 year old girls on Tuesday, exposing his privates and punching one girl in the face, splitting her lip.

Mr Ollerton stepped in and punched the 24-year-old, leaving him bleeding and dazed, before police arrived and arrested him.

He today told how he “does not stand” for men hitting women or children.

Mr Ollerton, who has a 15-year-old daughter, told the ECHO: “I was walking round Sefton Park with my Jack Russell, Rufus, and I heard the kids screaming.

“It didn’t sound normal, likes kids playing, so I doubled back.

“This young kid comes running up to me and says ‘my mate’s just been smacked by a fella’, so I went where is he?”

Mr Ollerton said Hoey, who pleaded guilty to exposure and assault at Liverpool Magistrates’ Court yesterday, emerged from near the bandstand trying to “square up” to a group of teenagers.

He said: “He threw his bag on a bench and he started trying to attack the girls and two lads they were with.

“I walked up to him and said ‘what’s going on here’? I told one of the girls to hold my dog, and the lad went for me.

“I punched him and punched him and punched him. I thought he only hit the girl and split her lip, if I had know the full extent of what he did it would have ended differently.”

Mr Ollerton, a full-time carer for his wife Vikki, says a passer-by shouted “stop, he’s had enough,” prompting him to walk away, but Hoey refused to calm down.

He said: “He staggered up, wobbling everywhere and started shouting ‘come on, you s***house’. I said ‘you have had enough, mate’.”

Mr Ollerton said he feared he would be in trouble and later attended a police station - only to be told Hoey had been arrested and that he need not worry.

He said: “My wife and daughter are proud of me, and it was nice hearing all the things people were saying about me.

“My daughter walks the dog round the park herself and it really hit home.

“When I heard the full extent of what Hoey did it made me feel sick. He deserves everything he gets. My wife said if she had been there she would have joined in!”

Hoey was recalled on licence after recently being released from prison for domestic violence offences, and will spend the next 11 months in prison.

He was sentenced to 18 weeks in jail for the new offences, and was ordered to sign the sex offender register for seven years.