A serving Met Police officer remains in custody after being arrested on suspicion of Sarah's kidnap and murder.
Adding to the shock, a Metropolitan Police officer in his 40s has been arrested on suspicion of kidnapping and murder in the case.
Everard had visited friends in Clapham and was returning home to Brixton, about 50 minutes walk, when she disappeared around 9:30pm.
Couzens is scheduled to appear before the Westminster Magistrates' Court on Saturday.
Her body was found in woodland near Ashford, Kent, a week later.
That includes examining how the suspect ended up requiring treatment in hospital Thursday for a head injury, which police have said he sustained while in custody alone in a cell.
The force said Couzens joined its ranks in 2018, and most recently served in the parliamentary and diplomatic protection command, an armed unit responsible for guarding London embassies and Parliament.
In the wake of her disappearance and killing, many women have taken to social media to share their own experiences of being threatened or attacked while walking outside.
"Following a referral of evidence by the Metropolitan Police related to the death of Sarah Everard, the CPS has authorised the police to charge Wayne Couzens with murder and kidnapping", Rosemary Ainslie, of the Crown Prosecution Service (CPS), said in a short statement.
She continues: "We have a responsibility to ensure that women and girls are safe, and feel safe at all times in all places: in public and in private, by day and by night".
Meanwhile vigils planned for Saturday in south London and elsewhere to honour Everard were thrown into doubt Friday after a High Court judge declined to rule on the legal right to protest under coronavirus restrictions.
In light of the case, MP Jess Phillips, during a parliamentary session Thursday, read out the names of 118 women and girls killed in the United Kingdom in the past year.
"But I completely understand that despite this, women in London and the wider public, particularly those in the area where Sarah went missing, will be anxious and may well be feeling scared", she said.
Although a body was found on Wednesday in a wooded area in Kent, it was not until earlier Friday that British police confirmed that they had identified the remains as those of Everard. Yesterday (March 11), it was announced that the Met would face an inquiry into whether it properly investigated a claim of indecent exposure involving the accused officer - an incident which happened just days before Everard's disappearance.