And today they appealed for anyone who was near the Kirkpatrick MacMillan bridge in Dumfries between 12.15 pm hours and 1 pm on the afternoon of July 15.
They are particularly keen to trace a person seen standing on the Kirkpatrick MacMillan bridge looking into the water for 15 minutes from around 12.30. This person then walked off towards Dock Park.
Call 101 if you can help.