The latest suspect in the case was detained on Friday.
A seventh person arrested in connection with the death of Andrew Jackson in Shirebrook has been released on bail.
A murder investigation was launched following the death of Mr Jackson in the town on Sunday 26 January.
Mr Jackson who was 55-years-old, was discovered at around 10am that day at an allotment, off Prospect Drive.
The 32-year-old man had been arrested on suspicion of murder.