Police constable Wayne Couzens, 48, also took responsibility for Everard's death but did not enter a formal plea on a murder charge in the 33-year-old marketing executive's killing.
Everard's death — allegedly at the hands of a police officer — has sparked a national reckoning over violence against women. Officials are calling for investigations into police response to the vigil.
Sarah Everard, 33, was last seen walking home alone from a friend's house last week. Authorities say they have found human remains and arrested a Metropolitan Police officer on suspicion of murder.