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. He has now died in prison.

Details of Grayson's death are not provided, but it is known that he was serving his sentence at the time. The circumstances of his death are not specified. Further information about Sean Grayson's case and his death can be found through the source.

The available details confirm that Grayson was a former deputy and had been convicted of the killing, but additional context is not provided.