LUCY LETBY’S “MYSTERY DOCTOR” FINALLY NAMED — THEN HIS OWN STORY TOOK A DARK TURN

For years, the man at the center of one of the most closely watched parts of the Lucy Letby case could not be publicly named.

He was known simply as “Dr A.”

Now, two months after his death, his identity has finally been revealed.

He was Dr Mark Deakin, a consultant paediatrician and married father of two who worked alongside Letby at the Countess of Chester Hospital during the period when prosecutors said she murdered babies and attempted to murder others. A court anonymity order protecting him was lifted on September 2, 2026.

And the story surrounding him did not end with his testimony.

THE DOCTOR WHO WAS ONCE CALLED HER “BOYFRIEND”

During Letby’s trial, prosecutors portrayed Deakin as an important part of the emotional background to the case.

They alleged Letby had developed a strong attachment to him and suggested that her desire for his attention formed part of a possible motive.

Letby rejected that characterization.

She described Deakin as a trusted friend and denied that they were romantically involved.

But their communications were extensive.

Court evidence showed that the pair exchanged more than 1,300 Facebook messages, some of which were later scrutinized because they involved confidential medical information.

Letby was reportedly deeply affected when Deakin appeared as a witness during her trial, breaking down in the courtroom as he gave evidence from behind a screen.

THEN CAME BABY N

One of the most controversial aspects of their relationship involved a premature baby known as Baby N.

Deakin and Letby exchanged messages that included confidential information about the infant’s medical care.

Letby was convicted of attempting to murder Baby N.

Years later, Deakin himself became the subject of an investigation at Alder Hey Children’s Hospital over his conduct, including issues surrounding access to medical records and his involvement in arranging observational visits for Letby after she had been removed from clinical duties at Chester.

The investigation eventually resulted in Deakin being dismissed for gross misconduct in June 2026.

A SHOCKING FINAL CHAPTER

Then, just one day after his dismissal, Deakin was found unconscious inside his car at a Cheshire retail park.

He was taken to hospital and later died on July 3, 2026, aged 53.

His death immediately attracted intense attention because of his connection to the Letby case and the events that had unfolded shortly before it.

But one crucial point remains unresolved:

The public has not been told the precise cause or circumstances of his death.

An inquest is due to formally open at Cheshire Coroner’s Court in Warrington on September 23, 2026. That hearing is expected to begin the process of examining what happened.

WHY WAS HIS NAME HIDDEN FOR SO LONG?

Deakin had been granted lifelong anonymity before giving evidence in Letby’s trial.

That protection remained in place even after the criminal proceedings and during subsequent legal proceedings connected to the case.

Following his death, Lord Justice Singh ruled that the justification for maintaining the reporting restriction no longer applied, allowing his identity to be made public.

For the first time, the public could finally put a name to the mysterious “Dr A.”

HE LATER SAID HE MAY HAVE BEEN MISLED

Perhaps one of the most striking parts of Deakin’s later story came during the Thirlwall Inquiry.

He acknowledged that Letby may have misled or manipulated him, a dramatic change from the professional relationship that had once existed between the two.

The doctor who had once defended her abilities was now being forced to examine how much he had understood — and how much he had failed to see.

That does not establish that Deakin knew about or participated in any wrongdoing by Letby.

But it adds another complicated layer to a case that has already raised extraordinary questions about relationships, hospital oversight and missed warning signs.

AND NOW, THE QUESTIONS

Lucy Letby remains imprisoned after being convicted of murdering seven babies and attempting to murder seven others.

Her case continues to face legal scrutiny, while Deakin’s death is now separately being examined by the coroner.

But his story has left behind a series of unanswered questions.

How close was his relationship with Letby really?

What did he know — and when did he know it?

Why did he continue to facilitate contact with Letby after concerns had already been raised about her?

And what exactly happened in the final days of his life?

For years, the public knew him only as “Dr A.”

Now they know his name.

But some of the biggest questions surrounding his story remain unanswered.