Matthew Ecker: Shooting, Motive, Trial, and Appeal

The Matthew Ecker murder case ended with the former Fergus Falls, Minnesota, nurse practitioner convicted of second-degree intentional murder for the December 16, 2022, shooting death of his girlfriend, 32-year-old nurse Alexandra “Alex” Pennig, in her downtown St. Paul apartment. Ecker told police Pennig had shot herself. Physical evidence at the scene, most notably a small metal fragment from the bathroom door lock found underneath her body, told investigators the door had been forced open before the gun was fired. A Ramsey County jury convicted him in February 2024, a judge sentenced him to 30 years in prison that April, and the Minnesota Court of Appeals upheld the conviction on April 21, 2025.¹

The Night of the Shooting

Ecker called 911 at about 2:50 a.m. on December 16, 2022, to report that Pennig had shot herself inside her apartment at the Lofts at Farmers Market in Lowertown. St. Paul officers arrived six minutes later and found her on her back in the bathroom with a single gunshot wound to the left side of her head.²

Ecker’s account to investigators: the couple had returned from several downtown bars, Pennig grabbed his handgun and locked herself in the bathroom, and she fired one shot. He said he broke the door open with his shoulder, tried to help, and washed his hands in the sink before calling 911. He also acknowledged moving the gun after the shooting. He first put it in his suitcase, then went back and placed it on Pennig’s chest, telling officers he was “scared of getting in trouble.”³

Building surveillance narrowed the window. Cameras showed Pennig and Ecker arriving at 2:05 a.m. after walking from Camp Bar. At 2:24 a.m., they stepped out briefly so Ecker could retrieve headphones from his car. At 2:30 a.m., they crossed the lobby together toward Pennig’s apartment. That was the last footage of her alive. The 911 call came 20 minutes later.²

Why Investigators Rejected the Suicide Story

St. Paul homicide detectives Abby DeSanto and Jennifer O’Donnell identified problems with Ecker’s account starting at the scene. The most decisive item was a small, round metal fragment from the bathroom door lock, roughly the size of a quarter. Crime scene technicians found it on the bathroom floor directly underneath Pennig’s head, discovered only after her body was moved.⁴

If Ecker had forced the door open after the shot, as he claimed, the lock piece would have landed on top of or beside Pennig. Her body was on top of it. “For us, it meant that the door was forced open before she was shot,” Detective O’Donnell said.⁵

Other physical details cut the same direction:

Ecker said he had washed his hands in the bathroom sink, but first responders found the sink completely dry. If the call had gone in as quickly as he said, DeSanto noted, the sink “probably would’ve been still wet.”⁵
The gun was found in Pennig’s left hand, but she was right-handed. Ecker himself called the wound’s location “weird” given her dominant hand.⁶
Pennig’s feet were straddling the bathroom door, not tucked behind it as detectives would expect if the door had been forced open onto her.⁵
Ecker admitted handling and moving the gun, yet forensic testing found none of his DNA on it. The weapon was described as “remarkably clean.”³
Ecker had no visible blood on his body or clothing and tested negative for gunshot residue.²

The Relationship and a Possible Motive

Ecker, 44 at the time of the shooting, had worked in the surgical, trauma, and cardiovascular ICU at Mayo Clinic’s St. Mary’s Campus in Rochester before joining the Lake Region Healthcare Walk-in Clinic in Fergus Falls as a nurse practitioner in March 2020.³ He met Pennig at that clinic and began a relationship his defense attorney later characterized as “open.”⁷

Ecker was married to Elizabeth Ecker and a father of four. According to defense counsel, his wife did not know about the relationship with Pennig. The couple separated after the shooting and finalized their divorce in 2025.⁷

Investigators also learned Ecker had been using his prescribing authority to supply Pennig with controlled substances, including Adderall and diazepam, and had been helping pay her rent. He disclosed none of that during initial questioning. Detectives speculated the shooting may have grown out of a struggle to keep Pennig quiet so his wife would not find out about the affair.⁵

Charges, Trial, and 30-Year Sentence

Ramsey County prosecutors charged Ecker with second-degree murder on December 19, 2022, three days after the shooting. He had no prior record and was released on a $500,000 bond while awaiting trial.⁸

At trial, the defense argued Pennig had died by suicide and pointed to her history of depression and addiction. Prosecutors relied on the physical evidence, the surveillance timeline, and the 20-minute window between the couple entering the apartment and the 911 call.⁴ On February 16, 2024, the jury found Ecker guilty of second-degree intentional murder. He was taken into custody after the verdict.⁸

On April 3, 2024, the court sentenced Ecker to 30 years in prison with credit for 57 days already served.⁹ Pennig’s family spoke at the hearing. Her father, Jim Pennig, told the judge Ecker “made an oath to provide care and protect the sanctuary of life” but instead “took her life violently with no regard for humanity.” Her older sister, Dr. Brady Pennig LaBombard, said Ecker had manipulated her sister by supplying alcohol, money, and inappropriately prescribed drugs, and “held an invisible noose around her neck.” Ecker did not address the court, and family members said afterward that they had been waiting for a statement of remorse that never came.¹⁰

The Appeal

Ecker appealed to the Minnesota Court of Appeals, arguing the evidence at trial was not enough to disprove that Pennig had died by suicide. On April 21, 2025, the appeals court unanimously rejected that argument and upheld the conviction.¹

1
Twin Cities Pioneer Press. MN Court of Appeals Upholds Matthew Ecker Murder Conviction
2
CBS News. Alexandra Pennig Murder: Surveillance Video Timeline
3
Twin Cities Pioneer Press. Fergus Falls Man Charged With Killing Girlfriend at Downtown St. Paul Apartment After Reporting Death as Suicide
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CBS News. Alexandra Pennig Matthew Ecker Minnesota Nurse Murder Evidence
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CBS News. Alexandra Pennig Murder Matthew Ecker St. Paul Minnesota
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Yahoo News. 48 Hours Highlight St. Paul Case
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Valley News Live. Opening Statements Thursday Murder Trial Fergus Falls Nurse Practitioner
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Yahoo News. Boyfriend Said Suicide Found Guilty
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FOX 9. Fergus Falls Man Sentenced Murder Girlfriend Reporting Death Suicide
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Star Tribune. Sentencing Hearing for Matthew Ecker