It remains unclear whether Noor Mateen was aware of the carnage her husband was inflicting on club-goers at the Pulse nightclub on June 12 when she received the messages. It was unclear what the messages said and it was also unclear what, if anything, she knew about the attack before it was perpetrated.
A law enforcement official previously told ABC News that she may have known something about the massacre in advance but claims she tried to talk him out of the assault.
Officials are trying to assess the veracity of that claim.
The FBI has obtained subpoenas for financial records, which means that there is now a grand jury investigation. However, sources tell ABC News this grand jury is not looking at Noor Mateen specifically. Rather, it was previously impaneled, and for the moment, is being used only as an investigative tool.
Both the shooter's wife and Mateen's father Seddique, have been placed on no-fly lists by federal officials, as they remain under scrutiny.