Eight people questioned by the RUC in connection with the death of Ms Elizabeth O'Neill in Portadown, Co Armagh, were released without charge yesterday.
The four men and four women were detained by RUC officers investigating the death of the 59-year-old mother of two.
Ms O'Neill died when a loyalist pipe-bomb exploded in the hall of her home in the Corcrain estate in Portadown in the early hours of last Saturday.
Ms O'Neill, a Protestant, was married to a Catholic.