Knife-wielding boy, 13, who ran over and killed grandmother Marcia Grant, 60, with her own car will serve two years in custody for causing her death by dangerous driving

A 13-year-old boy who ran over and killed a 60-year-old grandmother with her own car has been told he will serve two years in custody for causing her death by dangerous driving.

The judge, Mrs Justice May, heard how the boy ran over social worker Marcia Grant outside her Sheffield home despite the frantic attempts of her husband, Delroy, to stop him.

Speaking at Sheffield Crown Court, the judge told the boy: 'You made a bad choice. You knew that taking her car was wrong. You knew that taking her kitchen knife was wrong.'

She said: 'The offence you committed was serious but it was not murder.'

She said: 'The prosecution have accepted that you did not mean to harm Mrs Grant.'

The judge said it was a 'very bad accident'.

The judge described how Mrs Grant was a committed foster carer who she said was the 'shining lodestar' of her family.

This is a breaking news story and will be updated.