In the week before Christmas 2022, 32-year-old nurse Alex Pennig was found with a single gunshot wound to her left temple in her Saint Paul studio apartment. Matthew Ecker, a nurse practitioner who had driven in from out of town, called 911 and let officers into the building. Ecker initially told police that Alex had taken a gun into the bathroom and shot herself, and that he had broken the door down after hearing the shot and tried to staunch the bleeding. He later acknowledged moving the handgun and told detectives he had set it on Alex’s chest to make it look like she’d shot herself.
Investigators quickly identified inconsistencies between Ecker’s account and the physical scene. The handgun was discovered on Alex’s left shoulder with her left hand on it, though she was right-handed. Detectives noted the bathroom door had been forced and recovered a small round fragment of the door lock under Alex’s head. Forensic testimony indicated that fragment could only have ended up there if the door had been forced open while Alex was still alive. Building security footage showed Alex and Ecker entering the lobby together, leaving, and returning; in the footage Alex appeared upset and stomped back into the building. The time stamp placed Ecker’s 911 call about 20 minutes after they had returned. Neighbors and officers described the scene as not looking right.
Ecker told police he had driven to Alex’s apartment after she called him, reporting an argument with her boyfriend, Shane Anderson, and saying she feared for her safety. He said he had brought his gun to protect her. Surveillance from a nearby bar that night captured Ecker and Alex at the same establishment as Shane and included footage of an earlier confrontation in which Ecker and Shane fought. Witnesses corroborated a physical encounter at the bar. Shane denied being violent with Alex and later cooperated with detectives.
Friends and family portrayed Alex as lively and caring. They acknowledged a history that included a past struggle with prescription addiction and a prior suicide attempt years earlier, but said she had sought help, rebuilt her life, and earned a nursing degree in 2019.
At the apartment, investigators found alcohol and six prescription pill bottles in Alex’s name. Several of those prescriptions had been written or refilled by Ecker, a licensed nurse practitioner. That prescribing to someone who was not his patient raised ethical concerns, though it did not in and of itself prove a crime. Text messages recovered by investigators showed Alex had told Ecker days earlier that she needed a “mental health break” and wasn’t feeling hopeful; friends and family disputed that those messages proved imminent suicidal intent. Investigators also sought access to Alex’s phone and other messages that might clarify her state of mind; at least initially, they were unable to access the device.
Forensic testing produced a mixed picture. Gunshot residue was found on Alex’s left hand and her DNA was on the weapon. Testing did not find gunshot residue on Ecker, nor was Ecker’s DNA detected on the gun. Detectives said Ecker admitted handling the weapon and argued he had wiped it before placing it on Alex. Prosecutors emphasized the lock fragment found under Alex’s head and the sequence of events suggested by the surveillance footage and the bathroom door damage, contending that those details were consistent with a theory that the door was forced open while Alex was still alive and that Ecker shot her and later staged the scene.
Ecker and his family maintained his innocence, saying he was a friend who had gone to protect Alex after she reported a domestic dispute. The defense argued the physical evidence — including gunshot residue on Alex’s hand and her DNA on the gun — supported the possibility that she fired the weapon herself. Defense lawyers presented alternative explanations for the lock fragment and the body position and challenged prosecution assertions about motive, calling suggestions that Ecker wanted to hide an affair or protect his marriage speculative. Medical experts for the defense highlighted the medical examiner’s ruling that the manner of death could not be determined, arguing the forensic picture was inconclusive and that the jury could not find homicide beyond a reasonable doubt.
Detectives continued to press the prosecution’s narrative at trial, focusing on discrepancies in Ecker’s accounts of when and how he called 911, the lobby video showing Alex’s demeanor that night, and physical details they said were unlikely under the scenario Ecker described. Prosecutors also noted that Ecker had prescribed multiple controlled medications to Alex despite her history of addiction and that he was the lone person who could explain what had happened inside the apartment.
The medical examiner ultimately ruled the manner of death undetermined. That ambiguity became a central element of the defense’s strategy, while prosecutors argued the totality of physical evidence and Ecker’s conduct supported a murder theory.
Ecker was charged with second-degree murder and went to trial in February 2024. After deliberation, a jury convicted him of second-degree murder. In April 2024, a judge sentenced Matthew Ecker to 360 months in prison. Alex Pennig’s family, friends, and community described relief at the verdict but said it did not erase their grief. Ecker’s family expressed shock and said they planned to appeal, continuing to assert his innocence.
The case drew national and local attention and raised difficult questions about forensic interpretation, investigative reconstruction, and the ethical boundaries of medical prescribing. For Alex’s loved ones, the verdict provided a measure of accountability; for others, doubts about motive and evidence underscored how complex and contested efforts to reconstruct a single night can be when physical findings are ambiguous and relationships are complicated.