A woman has been discharged from hospital after being seriously injured alongside a personal trainer who was stabbed to death on Bournemouth seafront.
The 38-year-old woman - who has not been named - is continuing her recovery, Dorset Police said.
The force added that four locations - two in Bournemouth and two in Croydon, south London - are being searched as part of the murder investigation.
Amie Gray, 34, was pronounced dead at the scene after police were called to reports two women from Poole had been stabbed on Durley Chine Beach, Dorset, at around 11.45pm last Friday.
In an update issued on Thursday, police said a 20-year-old man from Croydon, who was arrested on suspicion of murder and attempted murder, is still being questioned.
Detective Superintendent Richard Dixey said: "This has been a fast-moving and extensive investigation, which we continue to drive forward.
"The arrested suspect remains in custody having been transported from London to Bournemouth and is being interviewed by specialist detectives.
"Two locations in Bournemouth are being forensically examined and searched. Searches have also been conducted at two separate addresses in the Croydon area."
DS Dixey said the enhanced police presence in Bournemouth will "remain as we move into the weekend" and issued a renewed plea for information from members of the public.
He said: "I would also like to repeat our appeal for anyone with any information, no matter how small, that might assist our inquiries to please make contact with us."
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Ms Gray's wife Sian Gray paid tribute to her on Wednesday.
"Words cannot describe the pain that we feel. Amie was the most loving wife and mother," she said in a statement.
"Her giggly laugh and big smile will be hard to be without. A larger-than-life character. I will miss you immensely my love. To the moon and back, forever and always."
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Tap hereMs Gray's mother Sharon Macklin said her daughter was "beautiful inside and out".
"As a family we are devastated to have lost one of the most amazing, funny, kind and energetic souls," she said.
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