Exonerate
Exonerate /ɪgˈzɒn.ə.reɪt/ US /-ˈzɑː.nɚ.eɪt/ (verb)
to declare that somebody is not guilty of a crime, acquit, set free, exempt, free somebody from blame, absolve, vindicate, forgive, pardon, exculpate:
The suspect was exonerated due to lack of evidence against him.
Antonyms: inculpate, accuse, blame
Noun: exoneration
Adjective: exonerative