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10 July 2019, 17:33 | Updated: 10 July 2019, 17:59
It was because the a clasp was left open on a vital door.
An inquest today has concluded Rosa King's death was an accident following more than two hours of deliberation by a jury and six days of evidence.
Ms King had gone into the enclosure to clean its viewing windows, which allow visitors to see the tigers, before the zoo opened for the day at 10am.
Her body was discovered by a visitor to the zoo who looked into the enclosure from the public viewing area and raised the alarm at around 11am.
Nobody saw the attack happen and nobody saw what Ms King did in the immediate lead-up.
Police scenes of crime officer Nathan Searle described seeing a "large bloodstain on the ground, a set of keys and a blood-stained paw print" alongside a wet cloth, a squeegee and an upturned bucket near the keeper's gate to the enclosure.
Head keeper Katherine Adams said she believed Ms King, who was working alone, was trying to leave the paddock when she was attacked.
She said the tiger may have stalked Ms King after she entered the enclosure and attacked her some five minutes later.
Nicholas Moss, Cambridgeshire's assistant coroner, said that immediately after the attack a metal vertical slide, designed to isolate tigers from keepers in the enclosure, was found to be open.
A metal protective gate used by keepers to access the paddock and a wooden gate to stop members of the public entering a service area were also found to be open.
A police investigation found no mechanical faults and Sergeant James Thorne said it was easy to spot the position of the slides.
The inquest heard that the zoo's procedure was for a keeper to locate the tigers and ensure they were isolated by metal slides before entering the enclosure.
The jury, alongside its conclusion of accidental death, said that the zoo's procedure "depended entirely on the keeper reliably following their training".
Mr Moss said:
"The death in this case occurred despite the fact there was a simple system and keepers such as Rosa who were safety conscious knew what the system was and knew what the risk was.
While it was unexpected for Rosa not to follow that system it seemed to be due to human error, of which we are all prey."
Elizabeth Yeomans, a senior ergonomist for the Health and Safety Executive, said earlier in the inquest that sometimes, when a person has completed a task many times before, "you look and see what you think you should see".
Ms King may have been tired at the time, having worked 45-hours per week during the summer months and helping with night feeds for a serval kitten, a type of African cat, the inquest heard.
Colleagues described her as a "very safe" keeper who would not have taken shortcuts in her work.
Mr Moss said he would consider issuing a prevention of future deaths report on the "risk of those involved in safety critical work in zoos and also hand-rearing animals at night".
The zoo has since introduced a system of working where keepers speak to a colleague on a handheld radio as they carry out procedures.
Mr Moss said he was also concerned that the metal protective gate and the wooden gate had been left open "for a period that may have been as long as an hour-and-a-quarter" after the attack.
"For a considerable portion of that period the zoo had become open to the public and Cicip could simply have walked through the gate and attacked members of the public who had been admitted (to the zoo)," he said.
Since the attack the zoo has introduced an airlock style entrance system for keepers with two gates instead of one, Mr Moss said.
He said he was "likely" to issue a prevention of future deaths report to Defra, the Health and Safety Executive and the Local Government Association to ensure there are double keeper gates at all tiger enclosures.
Staff rushed to close the gate after the attack before the tiger could reach a public area and armed police attended, but the tiger was enticed into a safe area by staff using buckets of meat before weapons needed to be deployed.
Mr Moss praised the "quiet dignity" of Ms King's parents Peter & Andrea King through the inquest and said it was clear Ms King was an "exceptional individual".
Speaking after the hearing, Andrea King said: "I would ask that people remember Rosa for the person that she was and not what happened.
"Remember her for all she did for the animals in her care, the support she gave to conservation and animal welfare charities, the love she had of all creatures and the love and support she gave to family and friends."
She said that if you "take someone you love to the zoo" then "you'll be doing something that keeps Rosa's work alive forever", adding she continued to support Hamerton Zoo.