Pulse gunman Omar Mateens father was an FBI informant and later became the subject of a criminal investigation, a new court filing shows.

Lawyers for Noor Salman, Mateens widow whos charged in the mass shooting, now want the judge to declare a mistrial over the revelation.

Seddique Mateen acted as an FBI informant from 2005 to June 2016, prosecutors said in an email included in a motion to dismiss filed Sunday.

Salmans attorneys argued the elder Mateen used his FBI connection to block a 2013 investigation into his son.

Jury sees texts Pulse gunman, wife exchanged during massacre

Omar Mateen killed 49 people inside the Orlando nightclub before being fatally shot in a gunfight with police.

The government opened an investigation into Seddique Mateen following a search of his home the day his son shot up the gay nightclub in the name of ISIS.

Investigators found receipts from money transfers to Turkey and Afghanistan from March to early June 2016, the filing indicates.

Authorities had previously been tipped off that Seddique Mateen wanted to raise up to $100,000 to help fund attacks against the Pakistani government.

Widow of Pulse nightclub shooter admitted she knew about attack

Salman is the only person whos been charged in the mass shooting one of the deadliest in U.S. history and faces life in prison if shes convicted.

Her lawyers argued the information violates her so-called Brady rights, which requires prosecutors to hand over any potentially exonerating information before a trial starts.

The tearful widow told investigators she knew about the attack hours after it happened on June 12, 2016, FBI Special Agent Ricardo Enriquez testified last week.

I am sorry for what happened, she said in a statement entered into the court. I wish Id go back and tell his family and the police what he was going to do.