The two people re-arrested yesterday in the investigation of of the 22-year-old's death were released last night.
Joe, who was 22, was found dead in the River Gipping near London Road on Monday 13th August 2018.
A post-mortem examination found the most likely cause of death was 'immersion in water'.
A 29 year old man who was arrested on suspicion of murder has been released on bail until 4th March at 11am, and a 36-year-old woman who was arrested on suspicion of assisting an offender has been released under investigation.
They had previously been arrested in October last year, and released under investigation.
A 30-year-old man and a 24-year-old woman, both formerly from Ipswich, arrested on Thursday 17 January, on suspicion of murder were bailed to 12 and 14 February 2019 respectively.
A 28-year-old woman previously arrested on suspicion of murder in connection with the incident, was released under investigation.