A man in his 20s has been arrested on suspicion of murdering a mother-of-six.

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 on Sunday.

The results of a Home Office post-mortem were unable to establish the cause of death and further tests will be carried out.

Anita Rose was 57 years oldAnita Rose was 57 years old (Image: Suffolk police) On Wednesday afternoon, a man in his 20s from Brantham was arrested on suspicion of murder. 

He was taken to Martlesham police station for questioning where he remains. 

He is the third person to be arrested in connection with the murder probe.

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. 

The pair, both of the Ipswich area, were released on bail.

The walking route Anita Rose is believed to have takenThe walking route Anita Rose is believed to have taken (Image: Suffolk police)

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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 missing jacketPolice are still searching for the missing jacket (Image: Suffolk police) Suffolk 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. 

Ms Rose's Apple iPhone which was also missing from the scene has been recovered.

Anyone with information is urged to contact the Major Investigation Team at Suffolk police quoting 37/41580/24.