A police staff member has been given a final written warning for misconduct over their handling of a 999 call made by a man before he apparently killed three family members and himself.
Officers found the bodies of Bartlomiej Kuczynski, 45, his two daughters Jasmin Kuczynska, 12, and eight-year-old Natasha Kuczynska and their aunt Kanticha Sukpengpanao, 36, on January 19 2024.
The four were all found inside a property in Allan Bedford Crescent in Costessey, Norfolk.
Post-mortem examinations recorded that all four died of neck wounds.
The deaths of the two girls and their aunt were being treated as murder, while the death of Mr Kuczynski was not being treated as suspicious.
Norfolk Police said officers were not looking for anyone else in connection with the killings.
At an opening into the inquest into the deaths, area coroner Samantha Goward broke down in tears while reading out details of the girls' knife injuries.
Ms Goward teared up during the inquest before apologising to the court and reaching for a tissue.
The force had received a 999 call from Mr Kuzcynski on the morning of January 19 but officers were not deployed to the address until an hour later when police were called by a concerned dog walker, watchdog the Independent Office for Police Conduct (IOPC) said.
In an audio recording of the call, Mr Kuczynski said: "I am walking with the knife, I have just lost the plot."
Mr Kuczynski expressed concerns about his own mental state and said he was confused.
The call handler advised him to seek medical advice and police did not attend the property as a result of the call.
When questioned as part of the IOPC investigation, the call handler said he did not hear the word "knife" and would have acted differently had he done so.
The call handler was initially suspended but returned to work following a review and was put on restricted duties.
Norfolk Police said on Friday that a member of staff had been given a final written warning following a misconduct investigation into the handling of the 999 call.
The force said in a statement: "The IOPC investigation concluded the call handler had a case to answer for misconduct based on their handling of the call and failing to record their risk assessment in their decision-making.
"The force accepted this conclusion, and a misconduct meeting was held on June 26 2025 where the chair determined misconduct to be proven and issued a final written warning for 12 months."
The misconduct meeting was not held in public.
A full inquest into the deaths is anticipated to take place in 2026 pending the completion of a Domestic Homicide Review.
It has since emerged that Mr Kuczynski, who died of a “stab wound to the neck”, had been a mental health patient with the Norfolk & Suffolk NHS Foundation Trust (NSFT).
He had been admitted to the Norfolk & Norwich University Hospital (NNUH) by police in December and later discharged himself after he was assessed as having “mental capacity”.
A spokesman for the NNUH said: “We can confirm that the patient was taken to the emergency department by police on December 14.
“Following a comprehensive clinical assessment, the patient was assessed as having mental capacity and he left the unit before being reviewed again by the team.”
The NSFT said it would carry out a serious incident review.