Denver’s Premier Criminal Defense Firm

From DUI to First Degree Murder

Expert litigation in DUI, first-degree murder, post-conviction litigation, and everything in between.

Protecting Clients’ Rights at All Stages of the Judicial Process

Our criminal defense attorneys represent clients at every step of the criminal law process, including:


You are innocent unless the prosecution proves, beyond a reasonable doubt, that you committed the crime. This concept is the foundation of the American justice system. We hold prosecutors to the highest standards, and we have been very successful in obtaining complete dismissals during the preliminary stages of cases. In cases that proceed to trial, we have secured countless victories on behalf of our clients in matters ranging from driving under the influence (DUI) to first-degree murder. While marijuana is now legal in Colorado, we have extensive experience defending drug crime charges involving other narcotics, such as cocaine and heroin.


If you are convicted of a felony and sentenced to prison, you should consider an appeal to have your case reviewed by a higher court. When we represent you at trial, we diligently preserve issues related to judicial errors for appeal, and we are prepared to file a brief promptly. Many criminal defense lawyers only take cases up to the trial stage. If you have been convicted of a criminal offense, we urge you to promptly let us review your case to determine if you have appealable issues so you do not miss the filing deadline.

Post-conviction litigation

Even if you have exhausted your appellate options, you may still have an opportunity for post-conviction relief. Founding partner Patrick Mulligan is considered one of Colorado’s leading authorities in complex Rule 35(c) litigation and post-conviction proceedings. Our firm is one of only a handful in the state that pursues this important means of having a conviction overturned.

We have the experience, the knowledge and the resources to handle any criminal matter at any stage of the legal process.



“I knew within the first ten minutes of meeting Patrick that I was in good hands and for the first time since my arrest, my future didn't seem so bleak...”


"I believe Marshall's calm demeanor but aggressive approach made all the difference. I would highly recommend Marshall to anybody facing criminal charges..."


“Patrick embodies everything one could ask for in an attorney...”


“I was so fortunate to have had Marshall represent me! He took the time to get to know me personally, he made himself readily available to me when issues arose, and most importantly, he achieved a tremendous outcome in my case.”