Despite the fact that there were several witnesses to the attack on an elderly couple in the car park of the local Hemköp supermarket in the southern Sweden town, police have not yet been able to identify any suspects, local newspaper Helsingborgs Dagblad reports.
A 36-year-old man, who was in the car park at the time of the fatal assault, has however been taken in for questioning.
“His information is important for the investigation, but he is not suspected of any offence,” Göran Hassel at Skåne police told news agency TT on Thursday.
The man was released by police after six hours of questioning at 8pm on Wednesday.
The 78-year-old woman died from her injuries at Skåne University Hospital in Lund on Wednesday with relatives consenting to end her treatment after doctors said they were powerless to restore her to health.
Police remain confident that the crime will be solved and confirm that they are continuing to receive tips and information.
The group of local business people hope that their move will help to speed up the police investigation.
“We are all upset and angry over this assault. Sure there are reactions to other violent crimes also, but this was so brutal, and directed against defenceless pensioners,” said Staffan Aronsson, CEO of Basmetal AB, to the newspaper.
Aronsson added that the massive national media interest in the case is not good public relations for Landskrona.
“But we primarily want the person that has done this to be brought to justice,” he said.
The 78-year-old woman lost consciousness after she was punched in the face after trying to intervene on behalf of her 71-year-old partner who was being attacked by a man in a parking dispute.
After surgery at a neurological surgery unit in nearby Lund, her condition improved slightly before worsening again on Tuesday afternoon. She died in her hospital bed at around 4pm on Wednesday.
The assailant is reported to be in his twenties and left the scene in a small red car.
Police have made a public call for information to their 114 14 hotline.