Theresa Riggi, who killed her three children in an Edinburgh flat in 2010, has been found dead at a high security hospital.
Sky sources said she was discovered at Rampton High Security Hospital in Nottinghamshire, Skynews reports.
The 49-year-old was jailed for 16 years for killing her children, twins Gianluca and Austin, aged eight, and five-year-old Cecilia.
They were stabbed to death in a flat in August 2010.
After killing the three children, Riggi was badly injured after creating a gas explosion and jumping from the second floor balcony of the property.
She broke her pelvis but might have been killed had a neighbour not attempted to catch her, breaking her fall. When emergency services arrived, Riggi was also found to have stab wounds which were believed to have been self-inflicted.
California-born Riggi, who was initially charged with murder, admitted culpable homicide on the grounds of diminished responsibility in March 2011.
The deaths came amid a bitter custody battle between Riggi and the children’s father, Pasquale.
In July 2010, Riggi had gone missing with her three children and they were the subject of a missing persons appeal.
Police eventually traced them to a flat on the west side of Edinburgh on July 21, 2010, but officers took no further action.
On August 3, Theresa Riggi failed to turn up to a custody hearing.
The judge duly instructed that she be traced and a decision taken by social workers as to whether her children should be taken into care.