MYSTERY surrounds the death of a Broadmoor Hospital patient who was found unresponsive after a suspected overdose.

Dante Campbell Plant died at Frimley Park Hospital on April 1, 2015 after being rushed there from the high-security psychiatric hospital after staff were unable to wake him that morning.

Mr Plant, 25, was given a life sentence at the Old Bailey in 2006 after he was convicted of murdering his sister and setting fire to his south London family home with his parents inside.

He was also convicted of arson with intent to endanger life as well as the attempted murder of his 12-year-old brother after bludgeoning him over the head with an axe.

“He was a very reserved character,” his primary healthcare nurse, Ruvenko Sakupwanya, told jurors at Reading Town Hall on Monday, January 23.

“He was very selective in his expression and communication to others at the hospital. On most days he would sit in his room in the dark. He struggled a lot with expressing his thoughts and feelings.

“When he was feeling sad he would approach staff or come and talk to me, it did not seem like he had the intention of carrying out his thoughts.”

Senior coroner for Berkshire Peter Bedford heard how Mr Plant, who changed his name from Jack to Dante, asked to visit the hospital chaplain twice two days before his death.

He had been struggling to deal with insomnia, depression and anxiety leading up to the anniversary of his sister's death and had also been treated for epilepsy and bipolar disorder.

“I was on duty working the morning shift on March 31,” Ms Sakupwanya added. “At some point during the course of the shift Jack asked me to go to the hospital chapel.

“He had not made this request before and we viewed it as a positive step.”

Paramedics Jack Lord, James Daniel and Ashok Singal confirmed in statements read to jurors they were informed on arrival the patient had a history of 'hoarding medication and suicide attempts'.

James Daniel's statement read: “On arrival I saw that he had a reduced level of consciousness, the staff believed he had some kind of seizure and was in a post-seizure state.

“He was loaded into the ambulance and after arriving at Frimley Park Hospital at 11.52am he had another seizure in his hospital bed.”

Mr Plant was pronounced dead at 4.49pm.

Police officers who searched Mr Plant's room in the hospital's Canterbury rehabilitation ward at 7.30pm on April 1, did not find any trace of drugs but discovered a black journal with the words 'This book is the property of the deceased' written on the front page.

The inquest heard how a mental health team had assessed whether Mr Plant should be moved to a higher security ward as he presented a 'constant' risk which would 'fluctuate around birthdays and anniversaries'.

When he died, he was in the 11th year of his 15-year sentence.

A post-mortem report confirmed Mr Plant's cause of death was a high concentration of an anti-psychotic drug he had been prescribed.