The South West Norfolk MP has expressed her shock at the violent death of a 83-year-old dog walker who was stabbed to death near East Harling.
Norfolk Police confirmed a man aged in his 20s from East Harling, Norfolk, was being questioned in custody over the killing of Peter Wrighton.
More than 100 police officers joined an investigation after Peter Wrighton's body was found in woodland in Norfolk.
A Home Office post mortem examination concluded Mr Wrighton, from Banham, died as a result of multiple stab wounds to his neck and head.
Detectives were understood to be investigating whether Mr Wrighton had a row with another man moments before he was killed.
He added: 'Inquiries are continuing regarding the incident and detectives ask that anyone with information should contact Norfolk Police immediately'.
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He was describing by family as "a lovely, gentle husband, dad and grandfather".
"These are descriptions of people that we believe were in the area, not necessarily together but we're keen to trace them as part of our ongoing appeal to trace witnesses in the relevant area at the relevant time", said DS Smith.
Mr Wrighton, who was a married father-of-two and grandfather, had before volunteered at Bressingham Steam Museum as a guard on the trains and at Snetterton Dogs Trust.
"We want to help Peter's family and the people in the local area to understand what happened", he said.
'When we think of Peter we remember him with with fond and happy memories that will stay with us always'.
"This means we want to hear from you if you know something or you know someone who has information but who is for whatever reason reluctant to come forward themselves".