Learn how to say Investigated correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word investigate:
to inquire into (a situation or problem, esp a crime or death) thoroughly; examine systematically, esp in order to discover the truth
inˈvestigative, inˈvestigatory adjective
C16: from Latin investīgāre to search after, from in-² + vestīgium track; see vestige