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 killers' behavior in the story is pleasant.
( ( ( ( The ( killers ' ) ) behavior ) ( in ( the story ) ) ) ( ( is pleasant ) . ) )
(ROOT (S (NP (NP (NP (DT The) (NNS killers) (POS ')) (NN behavior)) (PP (IN in) (NP (DT the) (NN story)))) (VP (VBZ is) (ADJP (JJ pleasant))) (. .)))