'smiling' schoolgirl, 13, ‘stabbed mum-of-three 143 times then dumped body'

Marta Bednarczyk was found dead in her burnt-out home in Wellingborough,Northamptonshire (Picture: Tom Maddick SWNS)

A schoolgirl who stabbed a woman 143 times researched what the sentence would be if she was convicted of murder,a prosecutor told a court today.

Marta Bednarczyk,43,was found in a smoke-filled living room in her burnt-out home in Wellingborough,Northamptonshire in March where she was declared dead at the scene.

Although her body was found burnt in a fire,a post-mortem examination found Marta had suffered injuries to her neck and back,likely killing her before the fire.

A pathologist found she had suffered at least 143 sharp force injuries,including 65 in her head and neck with suggestions that more than one knife was used.

Marta had seven wounds in the front of her torso,33 in her back,ten in her arms and 18 on her hands and wrists.

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