Story highlights Robert O'Neill, who says he fired the fatal shots that killed Osama bin Laden, thought the 2011 mission was "one way"

O'Neill: "We were preparing to not come home"

(CNN) The former Navy SEAL who claims he fired the shots that killed Osama bin Laden said Saturday that, ahead of the 2011 raid, he purchased gifts for his children and had a "last conversation" with his father because he believed that the mission was "one way," and none of his team would make it out alive.

Robert O'Neill told CNN's Michael Smerconish about the preparations he made before he left for the trip, which included arranging to have a last meal with his kids and heading to the mall to buy them "never coming back presents."

"As depressing as that sounds ... I wasn't afraid, I was just focused, " O'Neill said to Smerconish.

"We were preparing to not come home."

O'Neill also recalled how he had arranged for a last conversation with his father.

Read More