He was so focused on killing Roth that he decided to smother him with a pillow. Wouldn't a quick and silent throat slashing have been more effective -- or if he knew he was on a suicide mission anyway, why not just shoot him a few times at close range? He must have been trained by the same Corleone ally who found the "twins" in Part III.
"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"
"I stood in the courtroom like a fool."
"I am Constanza: Lord of the idiots."
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