A former Illinois deputy has died while serving a prison sentence. Sean Grayson was convicted of killing Sonya Massey and received a 20-year sentence.

Details of his death are not provided, but it is known that he was in prison at the time. Further information about the circumstances of his death is available from the source.

The case involved the killing of Sonya Massey, for which Grayson was found guilty and sentenced to 20 years in prison, a sentence he was serving when he died.