The court ruled that as the woman had been thinking about ending her sons’ lives a week before she watched them die, she should be convicted of murder rather than manslaughter.
4-year-old Elias and 8-year-old Tevin were found dead in the water near the Munkholmen swimming area in Sigtuna, near Stockholm, in late September.
Suspicions were soon directed toward the boys’ 31-year-old mother.
The mother had been becoming increasingly unstable during the weeks prior to the tragic incident and she was experiencing severe financial problems.
After first denying she had killed the boys, the mother later admitted to pushing her kids into the water and watching them drown.
“Tevin didn’t scream but Elias screamed for a long time. It was loud and he shouted ‘no, no, no’,” the mother revealed during interrogations, according to daily Aftonbladet.
She also claimed that she had meant to drown herself as well.
“We were all supposed to die,” said the woman, according to the paper.
Since her arrest in the autumn last year she has been held at a secure psychiatric ward at Huddinge sjukhus, in southern Stockholm.
Two medical examinations have since confirmed that the woman has serious mental problems.