be most in the mind of the killer 
(ROOT (VP (VB be) (PP (ADVP (JJS most)) (IN in) (NP (NP (DT the) (NN mind)) (PP (IN of) (NP (DT the) (NN killer)))))))
(ROOT (VP (VB ) (PP (ADVP (JJS )) (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (NN )))))))