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According to the Expressen, Isakin Jonsson, 32, and his 40-year-old girlfriend had gone shopping, and then returned to their apartment.

Then while his girlfriend was asleep, Jonsson cut up the mattress with a knife and then slit her throat.

"I remember how I slit her throat. Then I went to the kitchen and started cooking," the Herald Sun quoted Jonsson as telling a court in the central town of Skovde.

Prosecutors said Jonsson cut off her head using a knife, a saw and scissors.

While the court found him guilty of murdering his girlfriend, a psychiatric examination found that he suffered from a severe mental illness, and he was sentenced to psychiatric care.

Jonsson showed no remorse in court and offered no motive either.

"There was no motive whatsoever. We were a couple with a future together. I've never felt this way with a girl before," he stated.