2014年，他因在家中用兩把菜刀刺殺妻子58次而被判處至少10年零8個月，並於2015年被轉移到萊斯特郡Market Harborough的HMP Gartree。
PPO審查說，2021年1月19日的一份安全情報報告發現，最近對他的牢房的搜查 "表明他可能參與了與Gartree的一名工作人員的不適當活動"，他被立即轉移到米爾頓凱恩斯的HMP Woodhill。
A man who killed his wife should have been under constant supervision before he died in prison, a report said.
The 36-year-old was found dead in his cell at HMP Woodhill on 21 January 2021 two days after he was transferred there.
In 2014, he was sentenced to a minimum of 10 years and eight months for killing his wife by stabbing her 58 times with two kitchen knives in their home and in 2015 transferred to HMP Gartree, in Market Harborough, Leicestershire.
The mental health team at Gartree continued to support him, following his earlier diagnosis, and in 2020 Sessacar was diagnosed with Attention Deficit Hyperactivity Disorder (ADHD).
The PPO review said a security intelligence report on 19 January 2021 found a recent search of his cell "suggested that he may be involved in inappropriate activity with a member of staff" at Gartree and he was immediately transferred to HMP Woodhill in Milton Keynes.
The following day staff increased their observations of Sessacar to three times an hour amid concerns for his welfare, the report said.
Ms Bingham said she was "concerned that [staff] did not consider placing Mr Sessacar under constant supervision to give them an opportunity to get to know him better and make a more informed assessment of his risk to himself".
The report has recommended "prison, healthcare and mental health teams consider all risk factors" when managing at risk prisoners and whether they need constant supervision.
A spokeswoman for the Prison Service said: "HMP Woodhill has acted upon all of the Ombudsman's recommendations, including renewed guidance for staff on how to properly manage prisoners with severe mental health issues."
A spokesman for Central and North-West London NHS Foundation Trust, which provides health services at the prison, said: "We agree with the recommendation of the PPO and have sent reminders about our policy to our staff, that they must consider all risks, when making these very difficult assessments."