A former Ukip county councillor is understood to have been arrested on suspicion of murdering his wife.
Stephen Searle, who also stood unsuccessfully as a Ukip parliamentary candidate in the 2017 general election, was being questioned by detectives on Monday after his wife Anne, 62, was found dead at the family home in Stowmarket, Suffolk.
They had been married for 37 years and had four children together but Mrs Pitkin was having an affair with a local man for several months, the inquest in Ipswich was told.
Post mortems revealed that Mrs Pitkin died from multiple stab wounds to the neck and her husband's death was from compression of the neck due to hanging.
An identical copy of the note on the bedroom door was found in Mr Pitkin's study and a separate note, addressed to Tommy was also found, said Mr Cutler.
Call the police and say I am sorry they have to deal with this.'Mr Cutler said the bedroom door had been barricaded from the inside and all the windows in the house were locked from the inside.
He added that there was no forensic evidence of any third party being involved in the deaths of the couple.
Today Suffolk's senior coroner Dr Peter Dean concluded that charity shop deputy manager Mrs Pitkin was killed unlawfully and carpenter Mr Pitkin's death was suicide.
Det Supt David Cutler of Suffolk Police told the hearing in Ipswich that the couple 'appeared to have a normal, loving marriage'.
Pitkin told their son Tommy to 'make himself scarce' on February 26 this year so they could discuss their finances now they were separated.
But their son returned to find the front door barricaded and called the police who found two bodies in a bedroom and a note.
The couple have been married for more than 30 years and reportedly have three sons and several grandchildren.