Sean Grayson, the former Sangamon County, Illinois, sheriff's deputy convicted of first-degree murder in the shooting death of Sonya Massey, has died in prison, authorities confirmed Sunday. Grayson had been incarcerated after his conviction in a case that became a focal point of national debate over police accountability and use of force.

Massey, a 36-year-old Black woman, was fatally shot by Grayson in July 2024 after she had called 911 for help at her Springfield, Illinois, home. Body camera footage released at the time showed Grayson shooting Massey in the face after she retreated toward her kitchen. He was fired from the department and later charged with murder, with prosecutors arguing the shooting was unjustified.

Grayson was convicted following a trial that received widespread coverage across the political spectrum. His case was among a relatively rare set of criminal prosecutions in which a law enforcement officer was found guilty of murder for an on-duty shooting. He had been sentenced to prison before his death.

The circumstances of Grayson's death in custody have not been fully detailed in initial reports. Prison officials and law enforcement agencies are expected to provide additional information as inquiries proceed. His death closes a legal chapter in a case that continued to resonate with advocates on multiple sides of the policing debate.

The Massey family and their attorneys had pursued accountability through the courts following Sonya Massey's death. Her killing prompted protests and renewed calls for police reform legislation at both the state and federal levels in 2024 and beyond.