CBS video retells the Emmett Till story in under 2 minutes as tree in DC is planted in his memory

The Capitol building sits on a 59-acre park that includes hundreds of trees.

The newest, a sycamore , was planted just today, in memory of a black teenager whose murder, nearly 60 years ago, helped spark the civil rights movement. 

"It was the end of my innocence as a child," said journalist and playwright Janet Langhart Cohen. The year 1955 changed her life.