And it's fitting that we are commemorating the life of the Reverend Dr. Martin Luther King with an evening of song. (Applause.) Because songs played, as all of you know, an important part in the civil rights movement that he led.

WHITEHOUSE: President Obama at the "Let Freedom Ring" Concert

Later that evening, after Rachel Martin had gone shopping, he went to check on the infant.

BBC: Barry McCarney

Zimmerman said in the audio interviews that he was driving to the grocery store that evening when he saw Martin walking in his neighborhood.

CNN: George Zimmerman: Trayvon Martin threatened my life