The police watchdog has reopened the probe in earlier attacks by Nottingham Killer Valdo Calocane after statements from the families of the victims.
The Independent Office for Police Behavior (IOPC) has previously drawn up a report that concluded that officers did not properly investigated an attack on warehouse workers by Calocane, who could have stopped his murder a month later.
Students Barnaby Webber and Grace O'Malley-Kumar, both 19, and 65-year-old caretaker Ian Coates were killed by Calocane in June 2023.
On Friday, the IOPC said it will invest again or Calocane's earlier history and an excellent arrest warrant were seen by officers before the investigation was closed.
A statement from the IOPC reads: 'We made our decision after the armed forces had provided new evidence, which had never been available before the IOPC.
'This followed on statements by the relatives who led to further investigation with the Leicestershire police.
'Our investigation into the handling of the Leicestershire police of the attacks of attack against Calocane was closed in September last year (2024). As a result, three officers had to be confronted with a misconduct meeting, which postponed the force.
“We will reject whether information with regard to the earlier history of Calocane and an excellent order for his arrest was seen by the officers before the investigation was closed.”
Grace and colleague University of Nottingham -student Barnaby Webber, both 19, were killed by Calocane
Calocane then stuck Ian Coates (depicted) to death and stole his van. He mowed three pedestrians, but they all survived
Paranoid schizophrenic Calocan was sentenced to an indefinite hospital order after allowing manslaughter by reduced responsibility and attempted murder
Calocane depicted when he shared a flat in the city last year
IOPC director Derrick Campbell said: 'Our sympathies remain with the families of Ian, Barnaby and Grace. We have received a number of representations from them and we responded as soon as we were able to provide the requested additional details.
'This is consistent with our policy to share evidence with interested parties, so that they can effectively participate in our research. 'To be reopened by the IOPC, it must meet one or more criteria, including important new information that comes to light that requires further research.
'That applies in this case and after careful consideration of this new information, we conduct further investigation with regard to what officers actually saw on police systems about Calocane, and in particular an excellent order for his arrest. Those who are closely affected by our decision, including the relatives and the officers involved, have been informed and we will complete this work as soon as possible.
'Every decision about the disciplinary outcome of our investigation will only be taken as soon as the new evidence and the results of these questions have been analyzed.
“Our director -general, Rachel Watson, has offered to meet the families of Ian, Barnaby and Grace to discuss this development and any worries.”
