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16 January 2018, 14:26 | Updated: 16 January 2018, 14:30
Three people have been arrested over the murders of two elderly people in Buckinghamshire.
Thames Valley Police said the investigation relates to the deaths of Peter Farquhar, 69, who died in 2015, and Ann Moore-Martin, 83, who died in 2017.
Both lived in the village of Maids Moreton, near Buckingham.
Police said the causes of death are yet to be determined.
Thames Valley Police said four properties are being searched as part of the investigation, including one in Milton Keynes, two in Towcester, and an address near Redruth in Cornwall.
The three men arrested on Tuesday remain in police custody.
A 27 year-old man from Towcester has been arrested on suspicion of two counts of murder, two counts of conspiracy to murder, two counts of suspicion of fraud by false representation, one count of conspiracy to defraud and two counts of burglary.
A 31 year-old man from Redruth has been arrested on suspicion of two counts of murder, two counts of conspiracy to murder, two counts of suspicion of fraud by false representation, one count of conspiracy to defraud and one count of burglary.
A 22 year-old man from Milton Keynes has been arrested on suspicion of one count of conspiracy to defraud, one count of conspiring to commit fraud by false representation and one count of suspicion of fraud by false representation.
Mr Farquhar was a retired part-time English lecturer at the University of Buckingham having previously taught at Manchester Grammar School and Stowe School.
Professor Stefan Hawlin, English literature programme director at the University of Buckingham, told the Press Association he was saddened to hear of the police investigation.
"He was a charming, erudite and deeply thoughtful man, he was thoroughly learned in literature. He was very well thought of."
According to an obituary in The Guardian, Mr Farquhar was born in Edinburgh before being educated at Latymer Upper School in London and Churchill College, Cambridge.
As well as lecturing, Mr Farquhar published three novels, and a character in the 2013 football movie Believe was based on him during his time teaching in Manchester.
Channel 4 News political correspondent Michael Crick, who was taught by Mr Farquhar at Manchester Grammar School and who remained life-long friends with him, said he was shocked by the police investigation.
He told the Press Association:
"Peter's death was very sudden and sad and it is all the more distressing that police are treating it as a possible murder.
He was one of the most extraordinary teachers of my life and many former pupils of Stowe and Manchester Grammar School would agree.
He was a very inspirational teacher to whom I owe a lot. He was somewhat of a father figure to many of us.
He kept in touch with successive generations of pupils and guided them through their early careers.
He was a deeply committed Christian."