A specific witness has been asked to contact the police as the investigation into Clive Porter’s death continues.
Mr Porter, 63, died in an incident on the Grand Union Canal near Broughton in Aylesbury at around 12.20pm on Monday, April 26.
Following his passing, a murder investigation has been launched, with a man of no fixed abode being charged with the crime on May 2.
A 41-year-old woman from Birmingham was also arrested on suspicion of assisting an offender and perverting the court of justice.
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She has been released on bail to appear at Aylesbury police station on May 24.
Senior Investigating Officer, Detective Chief Inspector Andy Shearwood, of the Major Crime Unit, said: “We are continuing to investigate the tragic death of Mr Porter, which took place on 26 April on the Aylesbury Arm of the Grand Union Canal.
“Our team continue to work to establish the full circumstances of the incident, and I am now appealing to a specific potential witness to please come forward with any information they may have.
“The image we are releasing was taken at 12.10pm on April 26, shortly before the incident took place, and shows someone who appears to be walking a dog along the towpath, near to Broughton Crossing, located very near to the car park on Broughton Lane.
“If you recognise this image to be you, or someone you may know, we would please ask that you contact us, as we believe that this person may have information relating to this investigation that could be very important.
“We are leaving no stone unturned and are very grateful to everyone who has come forward so far and provided information to assist with the investigation, and working out what happened on that day.
“Anyone who can help is asked to call 101, or report online. Please quote reference 845 of 26/4 while doing so.
"If you prefer to remain anonymous, you can do this by calling independent charity Crimestoppers on 0800 555 111.
"You will have 100% anonymity while reporting this way.”
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