Why it matters: Two suspects have now been released on bail as Suffolk Constabulary's Major Investigation Team continues to investigate Mr McNicholl's death.
The big picture: A post-mortem examination revealed William McNicholl, known as Billy, died from head injuries and a stab wound.
Latest developments:
The 17-year-old boy arrested on Wednesday has been bailed with conditions until 17 March
He was questioned at Martlesham Police Investigation Centre for two days
A woman in her 50s, previously arrested on suspicion of murder, remains on bail until 9 April
What's next: Officers continue to appeal for witnesses to come forward with information about the case.
Bottom line: Anyone with information should contact police quoting reference 37/162/25, either through their Major Incident Portal or by calling 101. Anonymous reports can be made to Crimestoppers.
