Margaret Penny and her hairdresser Claire Acocks were found beaten and stabbed to death at the Old London Coiffure in Portland in May 3, 1991.
Their bodies were found after Ms Penny failed to meet a friend for afternoon tea.
She had arrived for her regular 2pm appointment with Ms Acocks about 15 minutes late that Friday.
Ms Acocks was last seen alive at 3.05pm when she went outside to collect something from her car.
— The Standard (@WboolStandard) June 30, 2017