A three-year-old boy has accidentally shot and killed his mother as she changed her younger daughter's nappy, police have said.
Christa Engles, 26, was found with a gunshot wound to the head at her home in Tulsa, Oklahoma, on Monday afternoon.
The toddler is understood to have found the gun on a table near the sofa, Tulsa World has reported.
Police believe the toddler then accidentally fired the gun as his mother changed the nappy of his younger sister.
The woman was discovered when the children's grandmother arrived at the house.