Luigi Mangione describes daily prison routine in letter to nursing student following killing of UnitedHealthcare CEO

Luigi Mangione is currently residing in the Metropolitan Detention Center in Brooklyn (Curtis Means-Pool/Getty Images)

The United States federal administrative detention facility was opened in the 1990s and is reported to have had around 1,174 detainees, according to the Federal Bureau of Prisons.

According to U.S. District Judge Gary Brown, ‘chaos’ and ‘uncontrolled violence’ reign at the jail, with defense lawyer Xavier Donaldson claiming MDC has ‘a way of breaking people’, as per NBC News.

As well as an outdoor recreation facility, MDC Brooklyn consists of a medical unit with examination rooms and a dental suite, as well as a separate wing for educational programs and the jail’s library, reports the Associated Press.

Well, Mangione, who was transferred to the notorious detention building on December 19, has apparently now lifted the lid on what his life is like inside its four walls.

As reported by The Express Tribune, a social media user has taken to Reddit to share a picture of a letter she claims is from the University of Pennsylvania graduate.

The image of the letter was first shared via the popular Chinese social media app, RedNote.

After thanking Genevieve, the woman the letter is addressed to for reaching out, Mangione allegedly reported on February 26 that he had a ‘fair’ holiday season and that he was doing ‘just fine’ while awaiting trial for the murder of Thompson.

“My usual routine includes reading, eating lots of ramen, exercising, and spending time with my fellow brothers here,” the letter reads.

“We have chess nights on Wednesday, and it’s a fun way to pass time together.”