Moss Solves Cemetery Scandal: How Forensic Botany Helped Crack a Grave Robbery Case

A seemingly insignificant clump of moss played a pivotal role in unraveling a disturbing case of grave robbing at Burr Oak Cemetery in Alsip, Illinois, a suburb southwest of Chicago. The scandal, which first came to light in 2009, involved the exhumation of bodies, their relocation within the cemetery, and the subsequent resale of burial plots. Even as initial convictions were secured in 2015, a newly published research paper details the surprising scientific contribution of a botanical expert and a microscopic plant to the investigation.

The Unexpected Call to a Botanical Expert

Matt von Konrat, head of the botany collections at Chicago’s Field Museum, received an unexpected phone call from the FBI in 2009. Agents requested his assistance in identifying a plant specimen recovered from the disturbed gravesite. “One day in 2009, I answered the phone, and it was the FBI, asking if I could help them identify some plants,” von Konrat recounted. The specimen, a small fragment of moss, had been found embedded with human remains that had been reburied in a different section of the cemetery. Investigators were hoping to determine the type of moss and, crucially, how long it had been buried.

Identifying Fissidens taxifolius and Tracing its Origin

Von Konrat and his team meticulously analyzed the moss sample under a microscope, comparing it to the extensive collection of preserved specimens at the Field Museum. They identified the plant as Fissidens taxifolius, commonly known as common pocket moss. Further investigation revealed a critical discrepancy: this particular species of moss was not naturally occurring in the area where the remains were discovered. “We did a survey of the different kinds of mosses growing near the crime scene, and that species of moss was not growing there,” explained von Konrat. However, a large colony of Fissidens taxifolius was found growing in the area where investigators suspected the bodies had originally been buried. This provided strong evidence that the remains had been moved from one location within the cemetery to another. WTTW News details this crucial finding.

Dating the Disturbance: Chlorophyll Analysis and Metabolic Activity

Establishing the timeline of the grave disturbances was essential for the prosecution. The defendants argued that any prior disturbance of the graves could have been unrelated to their actions. To address this, von Konrat’s team focused on the metabolic activity of the moss. Even in a seemingly dead and preserved state, moss retains a small amount of metabolic activity within its cells. The rate at which this activity declines can provide an estimate of how long the moss has been buried.

The team measured the chlorophyll content of the recovered moss sample. Chlorophyll, the pigment responsible for photosynthesis, degrades over time as plant tissue decomposes. By comparing the chlorophyll levels in the evidence moss to samples of known ages – including freshly collected specimens and moss stored at the museum for 14 years – they were able to estimate how long the moss had been underground. The analysis indicated that the moss had likely been buried for only one to two years, bolstering the case against the cemetery workers and supporting the prosecution’s timeline.

The Significance of Bryophytes in Forensic Science

The Burr Oak Cemetery case highlights the often-overlooked potential of bryophytes – a group of non-vascular plants that includes mosses, liverworts, and hornworts – in forensic investigations. Von Konrat and his colleagues published a review in 2025 examining the use of bryophytes as evidence in criminal cases, uncovering only about a dozen such instances over the past century. As reported by WTTW, this case is now a key example in the field.

“Mosses are often overlooked, and we hope that our research will help raise awareness that there are other plant groups out there, apart from flowering plants, and that these serve a remarkably key role in society and around us,” von Konrat stated. “But most importantly, we wish to highlight this microscopic group of plants as a tool for law enforcement. If One can elevate mosses as potential evidence, maybe it could help some families somewhere in the future.”

Burr Oak Cemetery: A Historic Graveyard and Community Hub

Burr Oak Cemetery, established in 1927, holds a significant place in Chicago’s history. As detailed on Wikipedia, it was one of the first cemeteries in the area specifically designed to serve the African-American community during the Great Migration. The cemetery became the final resting place for many prominent figures, including Chicago blues musicians and athletes. The desecration of graves at Burr Oak was therefore not merely a criminal act, but a profound violation of a culturally and historically important space. The initial scandal broke in 2009, leading to the convictions of four employees for desecration and other charges. The New York Times covered the initial anguish and response to the discovery of the removed bodies in July 2009.

The Role of Forensic Botany and Future Applications

The success of the forensic botanical analysis in the Burr Oak Cemetery case underscores the growing importance of interdisciplinary collaboration in criminal investigations. Doug Seccombe, a former FBI agent involved in the case, emphasized the value of the Field Museum’s botanical expertise. “Every once in a while, a case comes along where the FBI has to call in experts to aid in the collection of evidence…The Burr Oak Cemetery case was one of those cases where we reached out to the Chicago Field Museum Botanical Program, which proved to be extremely invaluable.”

While the use of plant evidence in forensic science remains relatively rare, ongoing research continues to explore its potential. Further studies are needed to refine methods for dating plant material and to expand the database of plant species and their distribution patterns. This will enable forensic botanists to provide increasingly accurate and reliable evidence in future investigations, potentially bringing closure to families and justice to those responsible for crimes involving disturbed burial sites.