TAMPA — In his first interview with the news media, George Zimmerman, the neighborhood watchman charged with second-degree murder in the killing of Trayvon Martin, apologized on Wednesday to Mr. Martin’s parents for the death of their son but said he did not regret his actions.

“It was all God’s plan, and for me to second guess it or judge it,” Mr. Zimmerman said, his voice trailing off. Mr. Zimmerman also defended himself against accusations that he was suspicious of Mr. Martin because he was black.

“I am not a racist, and I am not a murderer,” he said during his hourlong interview in Sanford, Fla., with Sean Hannity on Fox News. Mr. Zimmerman’s lawyer, Mark O’Mara, sat by his side.

Mr. Martin, an unarmed 17-year-old, was shot as he walked on a rainy evening to the home where he was staying as an invited guest in Sanford. Mr. Zimmerman reiterated that he shot Mr. Martin on Feb. 26 in self-defense after the teenager knocked him down, punched him, slammed his head into the pavement repeatedly and tried to suffocate him.