Culpable

According to what she said, he's culpable.

Tom was arrested and charged with culpable driving.

Someone who sees something wrong being done and does nothing about it, is as culpable as the perpetrator of the act.

He had not kept his bowels and nervous system, all his life long, under the influence of rum, tobacco, opium, coffee, tea, or highly seasoned food. He did not it is true, wholly deny himself any one of these, except opium and tobacco; but he only used them occasionally, and even then in great moderation. Nor was it from mere indigence, or culpable stinginess that he ate and drank, for the most part in a healthful manner. It seemed to be from a conviction of the necessity of being "temperate in all things;" and that such a course as he pursued tended to hardihood.

I am culpable for stealing your money.