Brittney Mortimer Found Guilty of Fentanyl Distribution Resulting in Death

On Friday, a jury found Brittney Mortimer, of Milliken, guilty of:

• Distribution of a Controlled Substance (Fentanyl) Causing Death, a class one drug felony
• (2) Distribution of a Controlled Substance (Fentanyl), a class three drug felony
• Distribution of a Controlled Substance (Methamphetamine), a class three drug felony

In February 2025, Fort Collins Police Services conducted a welfare check on Edward Dzienowski at the request of his family. Officers found Mr. Dzienowski deceased inside his apartment from a fentanyl overdose. 

An investigation by FCPS, assisted by the Northern Colorado Drug Task Force and the District Attorney’s Office, began into who provided Mr. Dzienowski the fentanyl that killed him. The comprehensive investigation eventually revealed that Ms. Mortimer had sold the victim drugs on four separate occasions, including the day he was killed. Text messages were found between Ms. Mortimer and the victim arranging the sales beginning mid-February 2025. 

There is an additional co-defendant in this case, whose case remains open. They are presumed innocent unless and until proven guilty beyond a reasonable doubt in a court of law. 

For her charges, Ms. Mortimer could face the following sentence. 

• Distribution of a Controlled Substance (Fentanyl) Causing Death (DF1)
  • 12-32  years in the Department of Corrections
  • Up to a $1,000,000 fine
• Distribution of a Controlled Substance (Fentanyl) (DF3)
  • 3-6 years in the Department of Corrections
  • Up to a $500,000 fine
• Distribution of a Controlled Substance (Fentanyl) (DF3)
  • 3-6 years in the Department of Corrections
  • Up to a $500,000 fine
• Distribution of a Controlled Substance (Methamphetamine) (DF3)
  • 3-6 years in the Department of Corrections
  • Up to a $500,000 fine

Sentencing for Ms. Mortimer will take place on January 5th at 3:00 p.m. in Courtroom 3B. 

“This case represents our fifth successful conviction for Fentanyl Resulting in Death prosecution in the 8th Judicial District—one of the highest numbers in the State of Colorado,” said District Attorney Gordon McLaughlin. “I commend our team and our law enforcement partners for their tireless work in presenting this case to a jury and pursuing justice for Mr. Dzienwoski and his family. We will continue to pursue justice for victims of the fentanyl epidemic and hold those killing members of our community accountable.”