A Prior Lake man accused of killing his mother is now facing the most serious charges Minnesota has to offer, after a Scott County grand jury indicted him on first-degree murder counts in a case that started with a welfare check at their home last April.
Prosecutors say 39-year-old Aaron Matthew Schlossin is now charged with premeditated first-degree murder and first-degree murder while committing criminal sexual conduct. The indictment was handed up this week after prosecutors brought the case to a grand jury, escalating what began as a second-degree murder complaint tied to a grim discovery in the 4500 block of Colorado Street SE.
According to KSTP, Prior Lake officers were called for a welfare check in April 2025 after a neighbor reported not seeing 67-year-old Diana Kaiser for several days. Officers looked through a bedroom window and spotted what appeared to be dried blood before going inside and finding Kaiser under a pile of blankets. Court documents say she had suffered significant trauma to her head and face. The neighbor told police he had seen Schlossin leave the home on April 24, do a "whippit" — inhaling nitrous oxide — and then go back inside, according to the criminal complaint.
An autopsy described Kaiser’s death as "complex homicidal violence," listing multiple blunt-force facial injuries, facial fractures, and cut and stab wounds, as reported by the Star Tribune. A detective noted a broken lamp resting on the victim’s body along with other signs she had been struck, court records state. Investigators also recovered a pair of bloodied jeans on top of the body, with Schlossin’s wallet and identification placed on them, according to the complaint.
The grand jury’s first-degree indictment upgrades the case from the second-degree murder charges filed last year, according to Bring Me The News. Scott County Attorney Ron Hocevar said, "To commit matricide is completely unfathomable, and to do so with such cruelty is heinous," adding that jurors determined the stiffer charges were appropriate. The indictment now includes a premeditated murder count along with a charge tied to alleged criminal sexual conduct during the killing.
Court records outline another disturbing allegation just one day after Kaiser’s death. Documents say Schlossin forced open a sliding door at a Burnsville home, pinned a woman against a refrigerator, and groped her before she fought him off with a bag of frozen meat, prosecutors say, as reported by the Star Tribune. He was later charged in Dakota County with second-degree criminal sexual conduct and first-degree burglary, and records show sentencing in that case is scheduled for April 30. Prior Lake Police Chief Liam Duggan told reporters the killing has been devastating for the family and said investigators pursued the case aggressively.
Legal Status and Penalties
Under Minnesota law, first-degree murder applies to killings that are premeditated or that occur while committing certain felonies, including criminal sexual conduct. Minnesota Statute §609.185 requires a sentence of imprisonment for life upon conviction. A first-degree conviction would therefore carry a life term, with parole eligibility and specific sentencing details depending on which clause applies and on the judge’s findings. With the indictment now in place, prosecutors will have to prove either premeditation or that Kaiser’s death occurred in the course of criminal sexual conduct to secure convictions on the upgraded counts.
What’s Next
The indictment sends the case back into Scott County District Court, where arraignment on the new counts and a round of pretrial motions are expected. Court records show a related sentencing date in the Dakota County case is set for April 30, according to KSTP. We will continue to track court filings and hearing dates as the case moves ahead.
