A man has been arrested on suspicion of attempted murder after a woman was found injured and unconscious.
Anita Rose was found by a member of the public lying on a track road near to Rectory Lane in Brantham, near to the sewage works and railway line, at around 6.25am on Wednesday, July 24.
At around 1pm on Saturday, July 27, Suffolk Police officers arrested a 45-year-old man from the Ipswich area on suspicion of attempted murder.
The man is currently being questioned at Martlesham Police Investigation Centre, where he remains.
It is not believed he was known to the victim, a police spokesperson confirmed.
Ms Rose had left her home at approximately 5am to take her dog, a springer spaniel named Bruce, for a walk.
She was taken to Addenbrooke's Hospital with a serious head injury and remains in a critical condition.
Specialist officers are supporting her family and keeping them updated on the investigation.
Detective Superintendent Mike Brown said: “We are still looking to establish the exact circumstances leading to this incident, but our initial enquiries are underway, and these will continue over the weekend.
“We continue to be extremely grateful for the support the community and the media have given us so far. This assistance we receive is absolutely key.
“A presence of officers is likely to continue in the area for the next few days with reassurance patrols. These officers are available to speak to concerned members of the community.
"These officers will also be conducting house to house enquiries, searching through CCTV footage and continuing on-going forensic work.
“This is a fast-moving investigation, and we are appealing to the local community for any further information which may aid this investigation.”
Anyone who saw any suspicious behaviour in the area, or who has knowledge of the incident that could help police in their enquiries, should contact officers, quoting crime reference 37/41580/24.
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