Federal prosecutors are expected to wrap up their case today against the widow of the Pulse nightclub gunman.

After a lengthy jury process and opening statements, the prosecution wrapped up its arguments as to how Noor Salman aided and abetted her husband, Omar Mateen, and lied to the FBI during its investigation into the Orlando nightclub shooting that left 49 people dead.

The June 2016 Pulse massacre was at the time, the deadliest shooting in modern U.S. history.

Day six of the trial, taking place in Orlando federal court, picked up where Wednesday left off -- with an information technology specialist.

There was a testy exchange between defense attorney Charles Swift and the specialist in cross-examination about Salman’s deleted text messages and the frequency with which she did so.

The analyst testified that there had been no political activity searched on Salman's phone, nor searches about the Islamic State, Disney, City Place, weapons, ammunition, Pulse or law enforcement.

But the notion of deleted messages appeared to be the theme for testimony that followed, from FBI electronics engineer Michael McFarland, who looked at periods of deleted data on Salman’s phone, to another FBI special agent, Richard Fennern, who also combed through phone data.

McFarland was asked by the government to focus on two key periods of time: April 28 to June 5, when no texts were recovered form Salman's phone; and June 6 to June 12, with more deletions.

He noted that Salman had two applications on her phone that cleaned it up; after testing, he concluded that neither would do anything without the user prompting.

When asked by prosecutors how the messages were deleted, McFarland replied, "My best guess is that the user did something to delete the messages."

Just before a mid-morning break, the prosecution handed out papers to jury members showing Salman's statements to the FBI.

As prosecutors questioned Fennern about cellular record analysis of phones belonging to Mateen and Salman, they paired the data recovered with surveillance video from Disney Springs and Walmart that showed the family making purchases, and presented Salman’s confession to the FBI: “I knew he was preparing for jihad.”

But the defense countered Mateen searched for extremist ideology all the time -- even in front of his parents.

There was an explosive moment at the tail end of the trial day, which resulted in the judge himself questioning a key witness for the prosecution.

Following the defense's cross-examination of an FBI agent, Byron seemed visibly angered. The agent admitted data did not corroborate Salman's statement to FBI that couple cased Pulse prior to attack, which was information that became a factor in judge's decision to revoke Salman's bond. 

It was a day that was meant for the prosecution to bring the argument home.

"The government doesn't need to be told to do the right thing. They must do the right thing," Byron said.

The defense, meanwhile, is expected to begin its case Monday morning. Salman has pleaded not guilty to the charges against her.

The family spokesperson says they are outraged that one of the reasons Salman’s bond was revoked was based upon evidence that’s been proven to be untrue.

Spectrum News 13 also learned that on Friday, Judge Paul Byron will hold a jury charge conference, which is open to the public. That withholding of information will likely be discussed at Friday’s jury charge conference.

This session starts at 9 a.m.