Sarah Everard had last been seen in Orr Street in her hometown of Kettering shortly before 9pm on Friday 19 June 2017.
That morning she’d told her mother she was having a sleep in and her mother got a message to say that Sarah was there, but then that went missing.
Officers began their search and soon found Sarah’s house and car.
Her body was found in a thick forest on Saturday 20 June at 2.30am.
Michael Blanchflower, a 47-year-old police officer from Kettering, was charged with Sarah’s murder on Saturday 20 June and on Monday 21 June was remanded into custody.
At the time of the arrest Senior Investigating Officer, DI Oliver Charnock, said:
“We continue to work closely with our partners and thank them for the assistance and time they gave during the initial stages of the investigation.
“Ms Everard’s family have been informed and have given us their full co-operation as we continue to pursue this case.
“We are continuing to investigate and this investigation is ongoing. We do not believe there is a threat to the public but we need anyone who may have information to come forward.”
At an inquest into Sarah’s death held in Southampton on 21 June Michael Blanchflower pleaded guilty to Sarah’s murder.
He was sentenced to life imprisonment with a minimum term of 25 years.