The news comes four months after the Deputy State Coroner referred Ms Day's case to the OPP,following a landmark coronial inquest into the 55-year-old's death,to assess whether criminal negligence had occurred.
"After an assessment of the evidence and receiving advice from the OPP,Victoria Police will not be proceeding with charges against the police officers in this matter.
“Victoria Police acknowledges the loss and suffering experienced by Ms Day’s family.
“Victoria Police takes any death in police care or custody very seriously and will continue reviewing the coroner’s findings and recommendations."
Ms Day,a Yorta Yorta woman,was arrested for the offence of public drunkenness after being found asleep on a train travelling from Bendigo to Melbourne on December 5,2017.