Timeline Of Orlando Shooter, Role Of Wife?

Investigators Wednesday worked to piece together a picture of nightclub gunman Omar Mateen and his crime and zeroed in on how much his Palestinian-American wife may have known about the plot that left 49 victims dead.

The FBI said it is still gathering evidence at the Pulse and poring through volumes of leads and tips about Mateen and those who knew him, and it urged anyone with any information about the killer to contact the bureau.

The FBI has also recovered Mateen’s phone, and are accessing its data to verify whether he previously visited the club, and various contacts he may have had. President Obama will go to Orlando on Thursday to meet with survivors and victims.

ABC News correspondent Aaron Katersky joined us from Orlando.