Sinn Fein president Gerry Adams has told ITV News there was "no basis" for his arrest in connection with the IRA murder of Jean McConville.
Mr Adams said he had nothing to do the Belfast mother-of-ten's death and denied knowing who killed her.
On Tuesday, Northern Ireland's Public Prosecution Service announced Mr Adams and six others, including Sinn Fein's northern chairman Bobby Storey, would not face any charges over the death. Mr Adams said the decision was "long overdue".
Mrs McConville was the sole carer for her ten children when she was taken away and executed by the IRA in 1972.They thought, wrongly, that she had been passing information to the security forces. Her body was not discovered until 2003.
Following the announcement, Mr Adams told ITV News he had "no part to play whatsoever in what happened" and that the killing of Mrs McConville was "wrong".
"I'm very mindful on the great hurt inflicted upon her family," he said.
"I think today's decision was long overdue.
"This whole terrible case is symptomatic of the great need for us to work for all the victims and to do so with compassion and transparency."
Mr Adams said he went voluntarily to be interviewed by the Police Service of Northern Ireland last year to scotch speculation linking him to the murder, adding that he would not be making any legal complaint about his detention.
He said Mrs McConville's "dreadful" abduction and killing had been seized upon by political opponents to undermine Sinn Fein.
The Sinn Fein leader also stood by comments about "dark forces" within the police and said there was work to do to ensure the Police Service of Northern Ireland did its job in an "impartial" way.
ITV News Correspondent Dan Rivers reports:
Mr Adams said: "There was no real basis for me to be arrested or interrogated on this matter. There's no real basis for the ongoing and very high profile media campaign against me. There's no real basis for the attacks on me around Mrs McConville's abduction, killing and secret burial."
He added that Sinn Fein wanted to make sure compassion and transparency were used when dealing with the families of the 'Disappeared' victims.