The killers were assumed to be rival Egyptians.
( ( The killers ) ( ( were ( assumed ( to ( be ( rival Egyptians ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS killers)) (VP (VBD were) (VP (VBN assumed) (S (VP (TO to) (VP (VB be) (NP (JJ rival) (NNS Egyptians))))))) (. .)))
The killers were thought to be Egyptian by pretty much everyone.
( ( The killers ) ( ( were ( thought ( to ( be ( Egyptian ( by ( ( pretty much ) everyone ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT The) (NNS killers)) (VP (VBD were) (VP (VBN thought) (S (VP (TO to) (VP (VB be) (ADJP (JJ Egyptian) (PP (IN by) (NP (ADJP (RB pretty) (JJ much)) (NN everyone))))))))) (. .)))