A 37-year-old man, from Northampton, was also interviewed in connection with the death of Adeyemi ‘Big Man’ Olugbuyi.
The latest developments come three months after the body of Adeyemi Olugbuyi was discovered in undergrowth in Billing Brook Road and a murder investigation was launched.
Two earlier arrests had already been made on February 26, when two men were also arrested on suspicion of murder. They remain on police bail.
The force said today it was continuing to try to establish the circumstances which led to the death of the 32-year-old, who was last seen near where his body was found in September 2013.
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Anyone with any information is asked to contact police on 101.