The employers of school cleaner Vincent Stanford say there were no "red flags" raised with them about his disturbing behaviour in the lead-up to Stephanie Scott's murder.
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This is despite court documents outlining how the 25-year-old killer was sighted at Leeton High School when he wasn't rostered on and was seen lingering around and entering the girls' school toilet block.
He had also managed to obtain the alarm code to the school even though the principal had requested that casual cleaners have no access to it.
Colin Joss and Co cleaning division spokeswoman Fleur Thompson told Fairfax Media if an issue was raised with the company, it would have been investigated.
"Clearly, if we had heard those sort of stories, we would have done something – we had nothing," Ms Thompson said.
"If someone had raised a concern, we would have immediately responded and investigated. No one ever raised any concerns. We had no idea."
Stanford has pleaded guilty to the murder and rape of Ms Scott, 26, on Easter Sunday last year, just one week before she was due to marry.
Ms Thompson said all mandatory police and working with children checks were done prior to his employment and that an internal review found that nothing more could have been done.
"During the six months that he was employed there was no concern raised with us about his behaviour and he completed all his cleaning tasks to the company's standards," she said.
"Unfortunately it was unpreventable, correct procedures had been followed."
She said the company and employees were all in complete shock when Stanford was charged with Ms Scott's murder.
"Everyone was in complete shock – you certainly never expect that – especially in a small country town."
During his sentencing hearing on Tuesday, Ms Scott's mother Merrilyn spoke of how Stanford had flouted the rules in the lead-up to her daughter's death and that "red flags" should have been raised.
"This despicable person had access to six schools, TAFE and Essential Energy. Within less than a week had begun flouting rules, and was not challenged," Mrs Scott told a special sitting of the NSW Supreme Court in Griffith.
"There were many behaviours that should have raised red flags; his behaviour in the community was also anti-social at best," she said.
"He should not have been at school that fateful weekend, but such was his arrogance that he did as he pleased."
Ms Thompson said a number of the company's employees knew Ms Scott, and had been very upset by her death.
"She's always in our thoughts and will never be forgotten. We think about the family too and how difficult times have been for them."
The company through their contract with the NSW Education Department, continues to clean Leeton High School and more than 1000 schools across NSW.
Stanford will be sentenced in Griffith on Thursday.
