The cover story details the disturbing behavior of the Littleton killers before last week's massacre.
( ( The cover ) ( ( ( ( story details ) ( ( the ( disturbing behavior ) ) ( of ( the ( Littleton killers ) ) ) ) ) ( before ( ( last ( week 's ) ) massacre ) ) ) . ) )
(ROOT (S (NP (DT The) (NN cover)) (VP (NP (NN story) (NNS details)) (NP (NP (DT the) (JJ disturbing) (NN behavior)) (PP (IN of) (NP (DT the) (NNP Littleton) (NNS killers)))) (PP (IN before) (NP (NP (JJ last) (NN week) (POS 's)) (NN massacre)))) (. .)))
The story has details about the killers' actions.
( ( The story ) ( ( has ( details ( about ( ( the ( killers ' ) ) actions ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NN story)) (VP (VBZ has) (NP (NP (NNS details)) (PP (IN about) (NP (NP (DT the) (NNS killers) (POS ')) (NNS actions))))) (. .)))