Direct Answer
Origen died around AD 254. The summary in Man of Steel: Setting the Record Straight on Origen says he survived imprisonment and torture under the Decian persecution, but died shortly after his release from the injuries he suffered there.
What Happened Before His Death
Origen's death is tied to his confession of Christ under persecution. The article says that when Origen was arrested and tortured for his faith, he proved worthy of his nickname Adamantius, the 'man of steel.' The article does not present him as someone who denied Christ under pressure. Instead, it says that even extended torture could not bring him to deny his Lord.
That is the main historical point the answer page should preserve. The date AD 254 is not an isolated biographical note; it belongs to the larger story of a teacher who suffered for the faith near the end of his life.
The Decian Persecution
The emperor Decius launched one of the most serious empire-wide pressures against Christians. The article says Origen was still alive when Decius was killed and the persecution ended. That means Origen did not die immediately in prison. He survived long enough to be released, but not long enough to recover from the harm done to him.
Careful Conclusion
The safest evidence-backed answer is this: Origen died about AD 254, soon after the Decian persecution, from injuries connected to his imprisonment and torture. The article does not give a day or month, so the answer should not pretend to know more than the source says. It should also avoid reducing Origen to later controversy. In the article's telling, his death was the death of a Christian teacher who endured suffering rather than deny Christ.
Read the Evidence Yourself
The main source for this answer is the Origen article linked above. Readers should compare the short answer with the source excerpt and the full linked article before treating the question as settled, especially where later summaries of Origen disagree. For broader historical context on Origen among other early Christian figures, see Who's Who in the Early Church?.