Hillsborough match commander David Duckenfield, 74, will face a retrial over the alleged gross negligence manslaughter of 95 Liverpool fans, judge Sir Peter Openshaw has ruled at Preston Crown Court.
The Crown Prosecution Service (CPS) sought a retrial after a jury was discharged in April following a 10-week trial.
The application was resisted by lawyers for the 74-year-old retired chief superintendent.
The judge said: "I authorise a retrial of defendant David Duckenfield."
Ninety-six men, women and children died in the crush on the Leppings Lane terrace at the FA Cup semi-final on April 15th 1989.
Under the law at the time, Duckenfield was not charged over the death of the 96th victim, Tony Bland, as he died more than a year and a day after the disaster
About 10 family members were in court on Tuesday morning as the judge made his ruling, which followed a hearing on Monday.
A retrial is expected to take place on October 7th.
Court was adjourned until later on Tuesday for legal discussions.