There have been some significant developments in the investigation surrounding Eugene Albert Horsch, a 44-year-old Philadelphia man whose property at 417 West Chew Avenue in the city’s Olney neighborhood has become the focus of an investigation involving Philadelphia police, the FBI and other agencies.
The investigation began almost accidentally on June 19, 2026, after a U.S. park ranger near Independence Hall noticed a disturbance involving Horsch and a woman inside a black BMW. The woman reportedly expressed concern that Horsch might hurt her.
Things became considerably stranger when the woman produced identification bearing her photograph but the name of another woman. That name was Blair Tonzelli, a woman who had disappeared several years earlier and who reportedly had connections to the Horsch family and the Chew Avenue property. Investigators began trying to determine why Blair’s identity was apparently being used.
A search of Horsch’s vehicle reportedly uncovered cocaine, fentanyl and marijuana, along with firearms whose serial numbers had been removed, a collapsible baton, a cattle prod and switchblade knives. Investigators also reportedly found fraudulent law-enforcement credentials. Horsch was subsequently federally indicted on charges involving firearm possession and fraudulent DEA and FBI identification documents.
Those charges are important to distinguish from what investigators would discover next. They do not mean Horsch has been charged with causing the disappearance or death of any of the missing women now being investigated.
Authorities turned their attention to the Chew Avenue house, where Eugene had lived with his father, Raymond Charles “R.C.” Horsch, before the elder Horsch died in 2025.
What investigators reportedly discovered inside resulted in the investigation expanding dramatically.
Authorities recovered numerous computers and hard drives, containers holding unidentified substances, chemicals, a 55-gallon drum connected to hoses or piping, firearms and gun-related evidence, fraudulent federal credentials and extensive written material. Five urns believed to contain cremated remains were also reportedly recovered. More than 20 containers containing unknown substances were sent for laboratory testing.
Then investigators began examining the digital evidence.
Police said they recovered approximately 600,000 images, 70,000 videos and more than 10,000 pages of writings, manuscripts and drawings. By August 12, detectives had reportedly reviewed only about five to seven percent of the material.
Authorities described some of what they encountered as graphic and dark.
Among the material were photographs and videos that investigators say appear to show two missing women inside the Chew Avenue house.
One was Gabrielle Amarando, who disappeared in September 2012.
The other was Maribel “Bella” Fresses, who disappeared in February 2018.
Investigators reportedly located images showing both women alive. More disturbing material apparently shows the women after they had died.
Neither woman’s remains have been located.
Without their bodies, the medical examiner cannot establish a cause or manner of death. Police have nevertheless said that, assuming the images and videos have not been manipulated, investigators believe Gabrielle and Bella are deceased. Their families have been informed of the discoveries.
Two other missing women have also emerged as significant parts of the investigation.
Blair Tonzelli is the woman whose name appeared on the identification allegedly being used by the woman who was with Eugene Horsch when he was initially detained. Blair reportedly had connections to the Chew Avenue residence and had worked as a home healthcare aide for Raymond Horsch. Reporting based on law-enforcement sources has also suggested there may have been a disagreement involving Blair and Eugene Horsch over money.
Then there is Amy Teresa McHale.
Amy disappeared in June 2016. She had previously been married to Eugene’s father, Raymond Horsch, and the Chew Avenue residence has been reported as her last known location. Her disappearance was investigated years before the current case developed, and Raymond Horsch was reportedly questioned at the time. The discoveries at the house have now brought renewed attention to what happened to her.
Eugene’s father is an important, albeit complicated, part of the investigation.
Raymond “R.C.” Horsch had a lengthy and unusual criminal history and worked as an erotic photographer and filmmaker. His creative work reportedly included violent imagery and fictional material involving serial killers and women experiencing addiction. Raymond died in May 2025, more than a year before the current investigation began.
That creates a significant challenge for detectives.
The Chew Avenue house was associated with both father and son over many years. Even if investigators can establish that something happened to one or more women inside the residence, they still have to determine when it happened, who was present and who was responsible.
There is another important complication: Eugene Horsch was reportedly incarcerated during at least one of the disappearances now being examined.
Investigators therefore cannot simply treat every piece of disturbing evidence recovered from the property as evidence against Eugene. Each photograph, video, document and physical item has to be dated, authenticated and connected to the person who created or possessed it.
There have also been some claims circulating about the case that require caution.
Despite earlier reports suggesting investigators had discovered a significant amount of blood inside the house, subsequent testing reportedly determined that the substance in question was not blood. Authorities have also not publicly announced the discovery of remains belonging to Gabrielle, Bella, Amy or Blair at the property.
Most importantly, Eugene Horsch has not been charged with murdering Gabrielle Amarando or Maribel Fresses, nor has he been charged in connection with the disappearances of Amy McHale or Blair Tonzelli. Authorities have not publicly established that he killed any of the women.
What investigators do have, however, is an extraordinarily unusual collection of circumstances surrounding a single Philadelphia residence.
Gabrielle Amarando disappeared in 2012 and apparently appears in material recovered from the property both alive and deceased.
Amy McHale disappeared in 2016 and reportedly had significant connections to the Horsch family and the Chew Avenue residence.
Maribel Fresses disappeared in 2018 and apparently also appears alive and later deceased in material recovered during the investigation.
Blair Tonzelli disappeared several years ago, had connections to the property, and her identity was apparently being used on the identification discovered during the incident that initially brought police attention to Eugene Horsch.
And investigators are nowhere near finished.
With hundreds of thousands of photographs and tens of thousands of videos still awaiting examination, authorities have acknowledged that the scope of the investigation could change considerably as detectives continue working through the material.
That leaves one particularly unsettling possibility hanging over the case.
Investigators don’t yet know whether Gabrielle Amarando, Amy McHale, Maribel Fresses and Blair Tonzelli will be the only missing women connected to the house.
For now, this is a suspected or possible serial-murder case. What authorities have uncovered is a complicated investigation involving multiple missing women, evidence apparently showing two of those women deceased, no recovered bodies connected to those images, and an enormous collection of physical and digital evidence that investigators are still trying to understand.
The answers to what happened inside that Chew Avenue house may already exist somewhere among those hundreds of thousands of files.
Investigators simply haven’t finished looking through them yet.
Sources: The Philadelphia Inquirer, NBC10 Philadelphia, 6ABC Action News Philadelphia, CBS News Philadelphia, FOX 29 Philadelphia, the Philadelphia Police Department and the United States Attorney’s Office for the Eastern District of Pennsylvania.
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