February 13, 2017, started as a typical unseasonably warm winter day in Delphi, Indiana. Abigail Williams, 13, and Liberty German, 14, headed to the Monon High Bridge Trail for a hike. They never came home. The case, which remained a haunting mystery for years, centered on a terrifying grainy video captured on Libby’s phone. It showed a man in a blue jacket walking toward them. He muttered four words that would become synonymous with the tragedy: "Down the hill."
People have spent years obsessing over the grainy footage and the "Bridge Guy" audio, but the core question—specifically how were Libby and Abby killed—remained a strictly guarded secret by the Indiana State Police for nearly six years. It wasn't until the arrest of Richard Allen in October 2022, and the subsequent unsealing of court documents, that the brutal reality of that afternoon began to emerge.
The Crime Scene and the Cause of Death
The girls' bodies were discovered on February 14, 2017, about 0.5 miles upstream from the Monon High Bridge. They were on the north bank of Deer Creek, on private property. When the probable cause affidavit was finally released, it confirmed the grim details that the community had feared. Both girls died from "wounds caused by a sharp object."
Essentially, they were killed with a knife or a similar bladed weapon.
Libby and Abby were found in a wooded area, and the scene was described by investigators as particularly "disturbing." While the cause of death was officially sharp force trauma, the specific details of the injuries were withheld to protect the integrity of the investigation. Authorities used this "hold-back" information to weed out false confessions and verify the credibility of witnesses. It's a common tactic in high-profile homicides. If someone knows a detail that wasn't in the news, they were likely there.
Clothing and Staging
The condition of the scene added layers of complexity to the question of how were Libby and Abby killed. Court documents revealed that the girls' clothing was missing or moved. Some items of clothing were found in the nearby creek. Curiously, Libby was found wearing some of Abby’s clothes, and vice versa, or their clothing was otherwise disturbed in a way that suggested the killer had spent time at the scene after the murders.
There has been significant debate regarding "staging" at the site. Early searchers and later court filings from the defense team suggested that the bodies were placed in specific positions. The defense even floated a theory involving "Odinism" and ritualistic sacrifice, claiming that sticks were placed over the bodies in patterns. However, the prosecution and lead investigators like Jerry Holeman have consistently pushed back against these claims, focusing instead on the forensic evidence linking Richard Allen to the site.
The Evidence Linking Richard Allen
The breakthrough didn't come from a DNA match on a national database. It came from a microscopic mark on a single piece of evidence: an unspent .40 caliber round.
During the initial processing of the crime scene, investigators found an unspent bullet lying between the bodies of the two girls. It hadn't been fired, but it had been cycled through a handgun. When police eventually searched Richard Allen’s home in 2022, they seized a Sig Sauer P226.
Forensic examiners at the Indiana State Police Laboratory concluded that the tool marks on the unspent round found at the scene matched Allen's gun "to the exclusion of all other firearms."
This piece of ballistics evidence is central to the prosecution's theory of how were Libby and Abby killed. They argue that Allen used the gun to force the girls "down the hill" and into the woods. While the gun wasn't the murder weapon—since the girls died from sharp force trauma—it was the tool of coercion. It explains how one man could control two teenagers in an open outdoor space.
The "Bridge Guy" Video
We can't talk about how this happened without talking about Libby’s bravery. She had the presence of mind to record the man approaching them on the bridge. In the video, the man is seen wearing a blue jacket, jeans, and a hoodie. His hands are in his pockets.
Investigators believe the heavy weight in his right pocket was the Sig Sauer P226.
The audio is brief. "Guys... down the hill." That was the last thing the world heard of them. That recording is perhaps the most famous piece of digital evidence in modern American true crime. It provided a timeline. It provided a visual. But for years, it didn't provide a name.
Confessions and the "Cycle of Violence"
After his arrest, Richard Allen was moved to various state facilities, including Westville Correctional Facility. During his time there, his mental and physical health reportedly declined. It was during this period that the prosecution claims Allen made over 60 confessions to his wife, his mother, and prison staff.
In these recorded phone calls, Allen reportedly admitted to killing Libby and Abby. He allegedly provided details that only the killer would know, including the nature of the weapons used. His defense team, led by Bradley Rozzi and Andrew Baldwin, has argued these were "coerced" or the result of a "psychotic break" brought on by the harsh conditions of his solitary confinement.
Still, the sheer volume of admissions has made the "how" and "why" of the case even more central to the ongoing legal battle.
Misconceptions and Rumors
The internet is a wild place. When a case goes cold for five years, people start making things up to fill the silence. One of the biggest misconceptions was that the girls were kidnapped and taken to a second location. The evidence proves otherwise. They were killed right there in the woods near the creek, likely within a very short window of time after being forced off the bridge.
Another rumor involved the "DNA" at the scene. People expected a "CSI" moment where a hair or a drop of blood would solve it instantly. In reality, the outdoor crime scene was subject to the elements. It rained shortly after the murders. Many of the biological samples were degraded. This is why the unspent round—a piece of physical, mechanical evidence—became the "smoking gun" for the state.
The Timeline of the Afternoon
- 1:35 PM: The girls are dropped off at the trail.
- 2:13 PM: Libby posts a photo of Abby on the bridge to Snapchat.
- 2:14 PM: The "Bridge Guy" video is recorded.
- 2:30 PM (approx): A witness sees a man matching Allen's description walking away from the area, looking "muddy and bloody."
- 3:15 PM: Libby's father arrives to pick them up, but they don't show.
The speed of the attack is terrifying. It suggests a killer who was either incredibly lucky or someone who had hunted in those woods before.
The Legal Battle and Forensic Challenges
The trial of Richard Allen has been a masterclass in procedural chaos. From leaked crime scene photos to the removal and reinstatement of defense attorneys, the "Delphi case" has never been straightforward.
The defense’s strategy has focused heavily on the lack of DNA and fingerprints linking Allen to the bodies. They argue that if Allen had truly committed such a visceral, "sharp object" attack, his DNA would be all over those girls. The prosecution counters that the environmental factors and the specific nature of the crime scene allowed for a lack of traditional forensic traces.
They are leaning heavily on the ballistics and the "confessions."
Honestly, the Delphi case changed how people look at small-town safety. It's a reminder that tragedy can happen in broad daylight, in a place that feels like home. The fact that Libby had the guts to record her own killer is the only reason there was ever a lead to follow. Without that phone, "Bridge Guy" would just be a ghost story.
What to Keep in Mind Moving Forward
If you are following the developments of the Delphi trial, it's vital to separate the sensationalist "Odinist" theories from the forensic reality. The court has a duty to look at what can be proven.
Key Takeaways for True Crime Followers:
- Monitor official court transcripts: Avoid "leak" websites that often strip context from the evidence. The unsealed probable cause affidavit is the most reliable source of information regarding the initial arrest.
- Understand the role of "Hold-Back" info: In high-profile cases, police intentionally withhold specific details (like the exact type of blade or the positioning of clothing) to ensure they can verify a true confession.
- Support victim advocacy: Organizations like the Abby and Libby Memorial Park focus on the lives of the girls rather than the macabre details of their deaths.
The question of how were Libby and Abby killed is a heavy one. It involves a mix of digital evidence, old-school ballistics, and the tragic bravery of two young girls. As the legal process continues, the focus remains on finding a definitive answer that provides justice for a community that has been grieving for nearly a decade.
For those looking to understand the legal nuances, researching the "Frye Standard" versus "Daubert Standard" in Indiana law can provide insight into why certain scientific evidence (like the ballistics match) is allowed or challenged in court. This trial will likely set precedents for how digital and ballistics evidence are treated in the age of social media investigations.