A 63-year-old woman arrested on suspicion blackmailing the owners of a Staffordshire guinea pig breeding farm, has been released on bail.
Gladys Hammond was related to the Hall family
Police said the woman was arrested at her home in Burton in what they described as a "pre-planned operation".
She was released on Thursday and will answer bail in late January.
The woman was held on suspicion of conspiracy to blackmail David Hall and others. Four people have been charged with blackmail offences.
The owners of the breeding centre - Darley Oaks Farm - are related to Gladys Hammond whose body was taken from a churchyard in Yoxall, Staffs, last year.
The four others charged with blackmail offences are Kerry Whitburn, 36, of Summer Road, Edgbaston, Birmingham; John Smith, 38, of Leicester Street, Wolverhampton; John Ablewhite, 35, of Hawley Street, Manchester and Josephine Mayo, 37, of Cottage Close, Chasetown, Staffs.
All four appeared at court at the beginning of December and entered not guilty pleas. Three were remanded in custody, while Ms Mayo had her bail extended.