Officers have been given a further 36 hours to question a man in his 20s who was arrested on suspicion of murdering a mother-of-six in a south Suffolk village.
Fifty-seven-year-old Anita Rose was found unconscious and with critical head and brain injuries on a track near Rectory Lane in Brantham on Wednesday, July 24.
She was taken to Addenbrooke's Hospital for treatment, where she died last Sunday.
On Wednesday afternoon, a man in his 20s from Brantham was arrested on suspicion of murder and was taken to Martlesham police station for questioning.
Police were later given an extra 12 hours to question the man over the incident.
Suffolk police has now confirmed officers have been granted a 36-hour extension to quiz the suspect, with it now running out on Saturday morning.
Police typically have 24 hours to question suspects in crimes from the point of arrest, but can apply for extensions in certain circumstances.
This is the third arrest relating to the incident after officers recovered Ms Rose's missing iPhone on Saturday, July 27.
A 45-year-old man was previously arrested on suspicion of murder and a 37-year-old woman was detained on suspicion of handling stolen goods - they have both been released on bail until October 25.
On the day of the attack, Ms Rose left her home address at 5am to walk her dog.
Detectives believe her final movements followed her usual dog walking route which started at Palfrey Heights, where she then turned onto a track road off Brooklands Rise which she followed to Rectory Lane before turning onto The Chase and the A137 Ipswich Road.
From there she would have turned onto Newmill Lane and taken a track road near the railway line.
A member of the public found Ms Rose lying unconscious on the track road at 6.25am.
Police are still searching for the pink zip-up jacket which Ms Rose is believed to have been wearing immediately prior to the incident.
The jacket is described as waterproof in material and is believed to be from an outdoor clothing brand like Regatta.
A spokesman has said there will continue to be a police presence in Brantham as officers conduct enquiries and anyone with information should contact Suffolk police, quoting crime reference number 37/41580/24.
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