Guilty (= having broken a law or disobeyed a rule)
Incorrect : The jury found him guilty for murder.
Correct: The jury found him guilty of murder.
Note: This word may also be used in the sense of showing a feeling of guilt or shame. In that sense it will be followed by ‘about’.
For example:
Incorrect : I feel guilty of breaking your cup.
Correct : I feel guilty about breaking your cup.