Police have named the man as Thomas Baird. He'd been stabbed and was pronounced dead in the early hours of Saturday after the blaze at his home in Westerdale, Hemel Hempstead, Hertfordshire.
A post-mortem examination carried out yesterday concluded that the 63-year-old died of trauma to the head and neck, and stab wounds to the chest.
A 30-year-old man from Hemel Hempstead, who was arrested on suspicion of murder on Saturday, remains in police custody.
More top news
Two women had to be rushed to hospital after the driver of a 'BMW' mounted the pavement in a hit-and-run crash.
The shocking moment a cyclist was threatened by a driver with a metal baseball has been captured on a video posted online.
Music festivals and big sporting venues put on on “high alert” - one of Britain's most senior anti-terror police officers has revealed.