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Crime Solvers Central
302 Cases Solved. Advancing justice for missing persons, unsolved homicides, unidentified and unclaimed remains.

Case Description

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Summary based on the NamUs case record (MP100938) and 6 other sources
In the quiet town of Gill, Massachusetts, a deeply concerning mystery began to unfold on March 29, 2022. On that Tuesday, 29-year-old Mateusz Koziol was seen for the last time. His sudden disappearance would leave his family, friends, and the local community with a void of unanswered questions and a lingering sense of unease. The circumstances surrounding his last known moments were centered around the French King Bridge, a location that would become the focal point of the initial investigation into his whereabouts. The discovery of his vehicle, abandoned near the Connecticut River in the Gill area, immediately escalated the situation, prompting an extensive and urgent search effort.

The response from local authorities was swift and thorough. The Massachusetts State Police, in conjunction with the Northwestern District Attorney's Office and local law enforcement from Franklin County, launched a comprehensive search operation. Divers were dispatched to scour the depths of the Connecticut River, while search crews meticulously combed the riverbanks and surrounding terrain. The proximity of his abandoned vehicle to the river was a significant cause for concern, leading investigators to prioritize the possibility that he may have entered the water. Despite these exhaustive efforts, which involved multiple agencies and specialized units, no trace of Mateusz was found. The days turned into weeks, and the weeks into months, with each passing moment deepening the anguish of those who held out hope for his safe return.

As time has passed, the active search for Mateusz Koziol has transitioned into an ongoing missing person case. He is described as a white male with black hair and brown eyes, standing between 5'7" and 5'8" tall, and weighing between 140 and 160 pounds. The investigation remains open, with law enforcement continuing to seek any information that could lead to a breakthrough. The case serves as a somber reminder of the fragility of life and the enduring pain that accompanies the unknown. The overview of the case is a story of a young man who vanished, a community that mobilized in an attempt to find him, and a family left to grapple with an unresolved loss and the faint, yet persistent, glimmer of hope.

Last Seen: Mar 29, 2022

Possible Unidentified Matches (4)

Unidentified remains cases whose details are consistent with this person, ranked by how closely they compare. Fields that are unknown in either case are left out of the score.

78%Possible
John Doe — Norwalk, Connecticut
UP101112 • Found Oct 8, 2022
View case
Sex ✓Male
Age 95%Est. 30–40 vs 29
Race 100%White
Location 72%117 mi away
TimingFound 6 months after last seen
Height 68%5'4" vs 5'7"–5'8"
Weight 75%106 lb vs 140–160 lb
Hair 100%Black vs Black
Eyes 100%Brown vs Brown
77%Possible
John Doe — Manhattan, New York - unidentified case UP114703
John Doe — Manhattan, New York
UP114703 • Found Nov 10, 2023
View case
Sex ✓Male
Age 85%Est. 30–50 vs 29 when missing
Race 100%White
Location 65%148 mi away
TimingFound 19 months after last seen
Height 100%5'6" vs 5'7"–5'8"
Weight 100%142 lb vs 140–160 lb
Hair 60%Brown vs Black
Eyes 100%Brown vs Brown
75%Possible
John Doe — Philadelphia, Pennsylvania
UP99882 • Found Jan 28, 2023
View case
Sex ✓Male
Age 100%Est. 25–40 vs 29
Race 100%White
Location 52%227 mi away
TimingFound 10 months after last seen
Height 100%5'6" vs 5'7"–5'8"
Weight 97%123 lb vs 140–160 lb
75%Possible
John Doe — Manhattan, New York - unidentified case UP138539
John Doe — Manhattan, New York
UP138539 • Found Feb 2, 2025
View case
Sex ✓Male
Age 85%Est. 30–50 vs 29 when missing
Race 100%White
Location 65%151 mi away
TimingFound 3 years after last seen
Height 100%5'6" vs 5'7"–5'8"
Weight 100%156 lb vs 140–160 lb
Hair 60%Brown vs Black
Eyes 60%Hazel vs Brown

These comparisons are generated automatically from public NamUs case data and are not confirmed identifications. Only DNA, dental or fingerprint comparison by investigators can confirm an identity. If you believe two cases are connected, contact the agency handling the unidentified case.

Unidentified photos are blurred because many are post-mortem. Tap a photo to reveal it.