Rachel Scott and Pierre Thomas have the latest on the investigation into the alleged second assassination attempt on former Pres. Trump, with the FBI saying the suspect may have been lurking for nearly 12 hours at the West Palm Beach golf course before being discovered; Mireya Villarreal has details on the massive inferno at a natural gas pipeline in the suburbs of Houston, Texas that forced evacuations for surrounding homes; the first image released of the Titan submersible about 300 yards from the Titanic's bow; Diane Sawyer speaks to the family of Christopher Reeve, and more on tonight's broadcast of World News Tonight with David Muir.