Murder detectives investigating a fatal flat fire have been searching a nearby fishing lake as the inquiry continues.
The 51-year-old had suffered burns and was taken to hospital, but later died.
A 54-year-old woman and a 51-year-old man were arrested and questioned at the time, but later released on bail, Derbyshire Police said.
However, the force said what it described as a "complex" investigation was continuing and that its officers had been searching a fishing lake called Barker's Pond on Wednesday.
The lake is about five minutes' walk from the scene of the fire.
"Over the last couple of months a dedicated team of officers have been working on this complex investigation in order to review any potential new lines of inquiry. "Local residents may see officers in and around the area of Barker's Pond today as they continue to carry out inquiries.< "In the meantime, I would like to encourage anyone with information that may help with our investigation to contact us. "We'd especially like to hear from anyone who was in the area of Barker's Pond on June 22 between 6am and 2pm and noticed anyone acting suspiciously."