Students from Sandy Hook Elementary School, many of whom were present on the day of last month's horrific Newtown shooting, gathered this morning on Good Morning America.

With assistance from singer/songwriter Ingrid Michaelson, the 20 children (ages 6-9) sang a cover of "Over the Rainbow," with the track now available on iTunes and all proceeds benefiting the Newtown Youth Academy, a local nonprofit, and the United Way of Western Connecticut.

Connecticut's top medical examiner wants to analyze the DNA of Adam Lanza in an attempt to learn more about what may have caused him to do what he did.

The 20-year-old was responsible for the Newtown, Conn., school massacre that left 20 children and six adults dead; he also killed his mother and himself.

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