The body of missing 18-year-old Shona Gillan has been recovered from the Six Mile Water, close to Riverside, in Antrim.
Police are appealing to the public for help in tracing the last-known movements of Shona.
She was reported missing on Saturday morning but had not been seen since the afternoon of Wednesday, 3 March when she left her home in the vicinity of Steeple Road, Antrim.
Inspector Julian Buchanan is urging anyone who believes they saw the teenager at any time between Wednesday and Saturday to get in touch with police.
Inspector Buchanan said: “As part of our investigation into the circumstances of her death we are keen to establish when and where Shona may have entered the water and to give her family those answers.
“This is obviously a deeply upsetting and distressing time for Shona’s family and loved ones, and I am appealing for anyone who saw or spoke to Shona in recent days, or who can provide information to police to please call us on 101, quoting reference 1122 06/03/21.”