Pending formal inquest proceedings, police have provisionally named the victim as 64-year-old Gary Henderson from Upper Dovercourt.
He was pronounced dead at the scene on Duke Street after 2.35pm on Wednesday 24th June, after falling from a third-floor balcony.
A post-mortem found the cause to be a severe traumatic head injury.
Yesterday afternoon, 25th June, a 27-year-old man from Ipswich was arrested on suspicion of murder and taken to Martlesham Police Investigation Centre for questioning.
A 26-year-old male from the Harwich area has been released under investigation, and a 24-year-old woman from Ipswich has been released on police bail until 22nd July.
Both were also arrested on suspicion of murder.
Anyone with information about the incident is asked to contact Suffolk Police on their website or by calling 101, quoting reference 34924/20.