Key facts
- Former Illinois sheriff's deputy Sean Grayson died in prison on August 23, 2026.
- Grayson was serving a 20-year sentence for the second-degree murder of Sonya Massey.
- Massey, a 36-year-old Black woman, was fatally shot by Grayson in July 2024.
- Grayson's attorneys sought medical release due to colon cancer, but the request was denied.
- Massey's killing led to national attention, protests, and legislative changes.
Sean Grayson, a former Illinois sheriff's deputy whose fatal shooting of Sonya Massey became a focal point for discussions on police use of force, has died in prison. Grayson, 32, was serving a 20-year sentence for the second-degree murder of Massey, a 36-year-old Black woman, whom he shot in July 2024.
Grayson's attorney confirmed his death on Sunday, August 23, 2026, but provided no further details. He had been diagnosed with colon cancer prior to Massey's killing, and his legal team argued for his release on medical grounds, citing the spread of the disease to his liver and lungs. However, the Illinois Prisoner Review Board denied his request for medical release in July 2026, just months into his sentence.
The incident occurred when Massey called 911 to report a prowler outside her Springfield-area home. Grayson and another deputy responded. Body camera footage showed Massey in her kitchen, holding a pot of hot water, moments before Grayson fired three times, fatally wounding her in the head. Grayson had threatened to shoot her if she did not drop the pot. Another deputy testified that he did not perceive Massey as a threat and only drew his weapon after Grayson did.
Grayson was initially charged with first-degree murder but was convicted of the lesser charge of second-degree murder in October 2025, following a trial where he claimed self-defense. He received the maximum sentence of 20 years in January 2026. Massey's killing sparked national attention and protests, leading to legislative changes such as the Sonya Massey Act, which mandates closer review of law enforcement applicants' employment records. The Justice Department also initiated a civil rights investigation, resulting in an agreement with local agencies to implement changes in policing and emergency response, including enhanced training for interactions with individuals with behavioral health disabilities and the development of a mobile crisis response program.