Sean Grayson, who was diagnosed with stage three colon cancer in 2023, was serving a 20-year sentence for second-degree murder

The former Illinois sheriff’s deputy convicted of fatally shooting Sonya Massey in her home after she reported a possible prowler to 911, has died, his attorney said on Sunday.

Sean Grayson died on Sunday, lawyer Daniel Fultz – who represented the ex-Sangamon county deputy at his trial – told NBC News and CBS News.