A 20-year-old man has been charged with supplying powerful hallucinogenic drugs, as police continue to investigate the death of a man in York.

Sam Donley, 20, is currently serving a prison sentence of more than six-and-a-half years for the manslaughter of Liam Miller in Hamilton Drive West, Acomb, last year.

During his trial, the court heard Donley had taken a hallucinogenic drug with Liam on the night of Monday, July 27, but when they did not immediately feel the effects, took more.

Leeds Crown Court heard Donley thought he was attacking a skull to get out of a dream world when he attacked Liam that night.

York Press: Liam Miller

Liam Miller

On Monday, North Yorkshire Police announced a 20-year-old man from Liverpool has been charged with "supplying six tabs of 25I-NBOMe, known as N-Bomb, a powerful hallucinogenic Class A drug".

Police said the sale happened in Liverpool between June 12 and 24 last year.

Donley killed Liam in a psychotic episode on July 27. He also attacked a second man who was passing by. The suspect is due to appear at York Magistrates' Court, sitting at Leeds Magistrates' Court, next month.

Liam was from Terrington in Ryedale and a former pupil at Malton School who studied music and art at York College. He later moved to university to study graphic design, and played guitar in a band called Nocebo with Donley.

Donley was originally charged with murder. The charge was changed to manslaughter after the prosecution consulted with psychiatrists and toxicologists about the effects of the drug. They told them Donley couldn't have known what he was doing, so the prosecution couldn't prove that he had intended to kill Liam.

York Press:

Police at the scene in Hamilton Drive West, York, in July 2015

Police previously said the drug can cause paranoia, violence, agitation, seizures and hallucinations, and it was made illegal in 2010. In June 2013, it was designated a Class A drug, making it the same category as heroin, LSD and cocaine.