Detectives are investigating the deaths of an uncle and niece at a caravan park.
Officers were called to Old Mill Lane in Forest Town, near Mansfield, just after 10pm on Tuesday 28 August.
Paramedics treated Richard Thompson, 66, and his niece Lisa Butler, 48, for their injuries, but the pair died a short time later.
Officers are now looking into the circumstances surrounding their deaths.
It's thought to be an isolated incident, with no one else involved.
Detective Inspector Rich Monk, who is leading the investigation, said: " Post mortems are taking place this evening to establish the exact cause of death however following our initial investigations we now believe this is an isolated incident and we are not looking for anyone else in connection with the deaths.
"Our investigation will continue to establish the full circumstances and we are liaising with the family to offer them support following this tragic incident."