A man has been found guilty of bludgeoning a world-renowned retired musician to death with a cricket bat in her garden. 

Rosemary Hill, 87, suffered a skull fracture and severe brain injuries after being attacked by her neighbour Guy Unmack while she was picking herbs outside her home in Reigate, Surrey. 

Mrs Hill, a former graduate of the Royal College of Music and internationally acclaimed clarinet player, passed away in hospital four days after the attack in June last year. 

Doctors were unable to operate on the mother of three due to the severity of her injuries.

She was given palliative care and died at St George’s Hospital, Tooting on June 25.

Mrs Hill had travelled the globe with orchestras before settling down to teach at Sir Keir Starmer’s alma mater, the Reigate Grammar School, for more than 20 years.

Witnesses told the court Unmack had been shouting "kill, kill, kill’" outside his house in the the run up to the attack and appeared to be regularly drinking from early morning trips to the supermarket

Guy Unmack, 46, beat the retired musician to death with a cricket bat

Credit: Hyde News & Pictures Ltd 

Police arrested Unmack shortly after the attack on suspicion of attempt murder. 

Following the 46-year-old’s arrest, he was assessed and deemed to be mentally unfit for interview and detention. 

Officers found he had twice the drink driving level of alcohol in his blood. 

He was placed under an involuntary order under Section 2 of the Mental Health Act and was subsequently moved to a secure hospital.

Officers worked to gather the evidence required, resulting in Unmack being re-arrested once fit to be interviewed and subsequently charged with murder on October 7 last year.

Jurors at Guilford Crown Court yesterday convicted Unmack of murder after a trial that lasted a week-and-a-half.

Senior Investigating Officer, Detective Chief Inspector Charlotte Rimmer said: "Guy Unmack was found guilty of murder by the jury at Guildford Crown Court.

"He will next appear at Guildford Crown Court on June 24 to be sentenced."