O'Donnell revealed that at the end of 2024, he was ordered to clear approximately 4,000 unresolved safety incident reports, including serious cases of self-harm, assaults, and racial abuse.
He described the directive as an attempt to "get these gone" amid the ongoing inquiry, expressing doubt that many reports were properly investigated.
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O'Donnell said, "It was a clear cover-up to try and silence me from speaking out."
He also alleged staff were advised to minimize information shared at inquests to protect the trust's reputation.
Baroness Kate Lampard, chairing the inquiry, noted delays in document production by EPUT, including the destruction of records due to asbestos contamination.
She pointed out that systemic failings identified in Essex are also present in other parts of the country.
The inquiry is monitoring similar issues at Tees, Esk and Wear Valleys NHS Foundation Trust, which faces a public inquiry.
Baroness Lampard is reviewing the use of Oxevision, an infrared monitoring system deployed in 40% of NHS trusts including EPUT, designed to track patient behavior and vital signs.
While some staff praised its role in physical health monitoring, expert witness Jill Archibald found no direct evidence linking it to improved care.
Studies cited by University of Oxford statisticians showed insufficient independent proof of the technology's effectiveness in patient safety or cost efficiency.
Some patients reportedly covered cameras with paper or stickers, and the system was occasionally used as a substitute for direct patient observation.
EPUT chief executive Trevor Smith expressed sorrow for the families affected and emphasized a collective responsibility within healthcare to improve care and build on past improvements.
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The inquiry is set to continue its proceedings in October 2026.
