The man accused of killing UnitedHealthcre CEO Brian Thompson in New York City last December has posted a statement on an online website – his first public words since his incarceration.

Luigi Mangione was arrested several days after he fatally shot Thompson on the street on December 4, 2024.

He had gone on the run before being identified in a McDonalds in Pennsylvania.

Luigi Mangione has been accused of murdering UnitedHealthcare CEO Brian Thompson. (AP)

He is facing multiple state and federal charges, including carrying out an act of terror, and is due in court next week.

Now, a website identified by CNN as having been created by Mangione’s attorneys has posted not only a message from the 26-year-old – but also advice on how to write to him in his Brooklyn prison.

The statement apparently indicates that Mangione, an Ivy League graduate, has received an outpouring of support while behind bars.

This undated photo provided by UnitedHealth Group shows UnitedHealthcare chief executive officer Brian Thompson. (UnitedHealth Group)

“I am overwhelmed by – and grateful for – everyone who has written me to share their stories and express their support,” he said.

“Powerfully, this support has transcended political, racial, and even class divisions, as mail has flooded MDC (Metropolitan Detention Centre) from across the country, and around the globe.

“While it is impossible for me to reply to most letters, please know that I read every one that I receive. Thank you again to everyone who took the time to write. I look forward to hearing more in the future.”

Mangione has pleaded not guilty. (AP Photo/Seth Wenig)

Online reaction around Mangione’s alleged acts have been mixed, with many US residents expressing their frustration with the healthcare and health insurance industries in the country.

UnitedHealthcare is one of the largest health insurers in the country.

Mangione’s legal team also provided a list of frequently asked questions for people seeking to find out more about the accused killer, donate to his legal defence – or even to write to him.

They note that the volume of correspondence – both written and graphic – is such that screenings could take longer than usual.

Timeline of a manhunt: How police tracked down alleged CEO assassin

“Luigi appreciates the photos that are sent and kindly asks that people send no more than five photos at a time,” the FAQ reads.

“Please note that every photo that is received is screened and reviewed by law enforcement.”

People are also able to send Mangione books, though his lawyers said he was currently at the maximum allowed capacity.

“Other than books, mail, news articles or photos, no other items can be sent to Luigi,” the FAQ reads.

Mangione has pleaded not guilty.

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