A 31-year-old man has been arrested on suspicion of murder after an elderly couple died following a fire at their home in St Helens.
Peter Eric Greener, 77, known as Eric, and his partner Sheila Jackson, 83, were caught in the blaze at their home on South John Street in the early hours of Tuesday.
Mr Greener died on Wednesday, while Ms Jackson died on Thursday.
Merseyside Police said an accelerant was used to start the fire.
On Sunday, the force said the suspect from St Helens had been arrested on suspicion of murder and remains in custody for questioning.
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Detective Superintendent Rachel Wilson said: “Although an arrest has been made, I would like to take this opportunity to remind people to pass on information directly to police or anonymously via Crimestoppers, and not to comment or post in any way which jeopardises this ongoing work.”
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DS Wilson said “extensive enquiries” continue.
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She added: “And to that end we are still appealing for anyone with information to come forward, particularly if you live in the area of South John Street and recall seeing or hearing anything suspicious at around the time of the incident.
“Please do not assume what you know has already been reported to us, as we can quickly make that assessment.”
