Exculpate
Exculpate , transitive verb
[Latin ex out + culpatus, past participle of culpare to find fault with, to blame, culpa fault. See Culpable.]
To clear from alleged fault or guilt; to prove to be guiltless; to relieve of blame; to acquit.
He exculpated himself from being the author of the heroic epistle.
I exculpate him further for his writing against me.