Blair Tonzelli, 35, was last seen in Philadelphia and reported missing by a friend on February 21, 2023, after an extended period of no contact. She is described as a white female, blonde or strawberry hair, green eyes, about 5 feet 6 inches to 5 feet 7 inches, and roughly 130 to 135 pounds. When last seen she was reportedly wearing gray sweatpants and a hooded sweatshirt. Friends said she had ties to the Kensington neighborhood and associated with a man who lived in Olney.

In June 2026 investigators working a separate matter linked Tonzelli’s name to a residence on West Chew Avenue in Olney after finding a fake ID bearing her name in the possession of a woman with a man identified as Eugene Horsch. A subsequent search of the Olney home uncovered a significant amount of blood, though no human remains were found at that time. Reports say Tonzelli may have worked as a home healthcare aide at that residence; one witness alleged a money dispute between Tonzelli and Horsch and claimed Horsch spoke about chemicals to dispose of remains. The case is also being connected to the 2016 disappearance of Amy McHale, last seen at the same property.

Many questions remain about what happened to Blair Tonzelli and how the Olney property factors into both disappearances. Anyone with information about Tonzelli, her movements in Philadelphia, or the West Chew Avenue residence is asked to come forward.