While still in intensive care, Bauman gave the FBI a description of the man he saw, his brother said. Bauman's information helped investigators narrow down whom to look for in hours of video of the attack, he said.
In the images released Thursday, both men wear hooded sweatshirts under dark jackets; one wears a light-colored baseball cap turned backward on his head, while the other wears a dark baseball cap facing forward. Both are carrying large backpacks.
"I've had many times alone with him, and yes, he told me every single detail," Chris Bauman said.
Paul Bresson, an FBI spokesman in Washington, declined to comment on specific tips in the investigation. Two FBI agents interviewed at the Boston office declined to confirm or deny the account.
Jeff Bauman wouldn't be the last to look into the eyes of one of the suspects. The hunt for the brothers touched off chaos and violence overnight that included a convenience store robbery and carjacking that escalated into the fatal shooting of the MIT officer. When police confronted the suspects, a gun battle ensued that resulted in the shooting of a transit police officer, who is in serious condition, according to David Procopio, a Massachusetts State Police spokesman.
On April 15, Remy Lawler, 25, was standing with Bauman, said her father, Arthur Lawler, of Amesbury. Remy is the roommate of Bauman's girlfriend, Erin Hurley. Shortly before the explosion, Remy moved closer to the finish line, away from Bauman and another friend, to take better photographs.
She suffered a baseball-sized shrapnel wound.
Shortly after, Lawler called her mother's cell phone and left a message in which she cried "Mom! Mom!" Medics could be heard telling her, "You're going to be all right," her father said.