On 20th anniversary of shooting, Columbine honors 13 lost with community service, ceremony

Cassandra Sandusky (right), a graduate of Columbine High School
Cassandra Sandusky (right), a graduate of Columbine High School, pauses with her friend Jennifer Dunmore at a row of crosses bearing the names of the victims of the attack at the school 20 years ago before a remembrance program for the victims Saturday in Littleton, Colo.