What Was Sean Grayson's Cause Of Death? Battled Colon Cancer, Plea For Early Release Was Rejected

Sean Grayson was 32 years old at the time of his death. He was convicted of murder for the fatal shooting of Sonya Massey at her house in 2024.

Former Sangamon County deputy Sean Grayson, 31, died on August 23, 2026, while serving his 20-year prison sentence. He was convicted in October 2025 of second-degree murder for the July 6, 2024, fatal shooting of Sonya Massey in her Springfield home after she called 911 about a prowler. For the unversed, Sonya was 36 years old at the time of her death. 

Notably, Sean Grayson received the maximum sentence on January 29, 2026. Although he sought medical release in May 2026, citing advanced colon cancer, his request was denied.

Sean Grayson was battling colon cancer for more than two years

Officials have not yet confirmed what caused Sean Grayson’s death. His lawyer confirmed that he died while in prison, but offered no immediate details about the circumstances. Grayson had been dealing with an advanced case of colon cancer. Reports state he first learned of the diagnosis in 2023, and the disease later spread to his liver and lungs.

His declining health became central to his legal efforts in 2026, as he tried to get out of prison on medical grounds. In July 2026, the Board rejected the early-release bid from the former downstate deputy who was convicted in the fatal shooting of an unarmed Black woman. According to NPR Illinois, the three-person panel, made up of two Republicans and one Democrat, denied him after deliberating for only 10 minutes and gave no detailed explanation.

Grayson, his attorneys, and his supporters were not present at the hearing. After the decision, Massey’s family and friends said they were relieved. Massey’s father, James Wilburn, expressed his satisfaction by saying that the panel did the right thing, adding that the board avoided a serious miscarriage of justice.

Sean Grayson had filed under Illinois’ Joe Coleman Medical Release Act, a 2022 law that lets incarcerated people who are terminally ill or severely incapacitated seek early release. Under the law, terminal illness is defined as an irreversible, incurable condition expected to lead to death within 18 months. His defense team said he had stage 4 colon cancer that had spread to his liver and lungs, first diagnosed in 2023.

Grayson said in his petition that his condition was irreversible, incurable, and likely to cause death within 18 months, although he could still handle basic daily tasks like eating and dressing himself. As part of its review, the board looked at a medical report from the Illinois Department of Corrections. Members also considered the cost of his care to the state and whether keeping him in custody would limit IDOC’s ability to care for other incarcerated individuals.

Sonya Massey was shot dead two years ago, in 2024

Also known as Sonya Lynaye Wilburn-Massey, she was a mother of two living in Woodside Township near Springfield, Illinois. She had worked at J&J Gaming and lived with lupus, which led to disability. She also dealt with mental health challenges.

On July 4 and July 5, 2024, there were multiple 911 calls, one where Sonya claimed that people were trying to hurt her, and another where her mother Donna warned dispatchers her daughter was having a mental breakdown. However, Donna also told the dispatchers that her daughter was not a danger and requested not to send combative policemen who are prejudiced.

On July 6, 2024, after Massey called about a prowler, Sean Grayson and Deputy Dawson Farley found nothing outside. Inside, over a pot of boiling water, Massey said, “I rebuke you in the name of Jesus.” Grayson drew his gun and fired three times. One shot hit Sonya below the eye, causing fatal injury. Farley testified he did not see her as a threat and was caught off guard.

When the incident happened, Sean Grayson was a former Army wheeled-vehicle mechanic with two prior DUI convictions who left the service with a general discharge for misconduct. Between 2020 and 2023, he worked for five different Illinois departments before Sangamon County hired him in May 2023.

What are your thoughts about Sean Grayson and his health issue? Let us know.

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