Sioux City, IA
712.255.8838
Sheldon, IA
712.324.4385
  Individual & Family

Criminal Defense

Criminal charges or allegations of criminal conduct do not have to ruin your life. You are not defined by your worst day, nor is your value determined by any alleged wrongdoing by the state or federal government. In America, you enjoy the many rights afforded to you by the constitution, including the presumption of innocence unless proven guilty.

At Heidman Law Firm, we will leave no stone unturned when it comes to your criminal defense. We will fight back with unrelenting tenacity to provide you with a skilled defense. We will also work hard to minimize the hardships you experience as a result of any criminal proceedings. We are dedicated to ensuring communication with our clients throughout each step in the process. When you need a criminal defense lawyer in Iowa, Nebraska, or South Dakota, turn to Heidman Law Firm.

Attorney Diane Murphy Smith has years of experience as a former prosecutor. She has strong negotiation skills and experience working with government agencies. As a criminal defense attorney, she is motivated to uncover any violation of your constitutional rights and to hold the state accountable for ensuring that the criminal prosecution is unflawed. Because where there are flaws in the prosecution, there is reasonable doubt.

Diane is a member of the following organizations and is licensed in Iowa, Nebraska, and South Dakota, including licensure in State, Federal and Appellate courts.

  • Member of the National Association for Drunk Driving (NCDD)
  • Member of the National Association of Criminal Defense Lawyers
  • Member of the Iowa Association for Justice, Criminal Law Division


Areas of Criminal Defense


  • DUI/OWI defense
  • Possession charges
  • Domestic assaults
  • Felony charges
Attorneys