The FBI has provided a major update on the death of Alonzo Brooks.
The man's unexplained death was featured in the Netflix series Unsolved Mysteries and the renewed interest in his case sparked loads of tip offs.
The intelligence agency has since ruled the man died via homicide.
Alonzo went to a party one night in April 2004 and was never seen again. Witnesses at the house party say Mr Brooks was the target of racial slurs that night.
A massive search effort was conducted in the local area and his body was found near the house at a creek outside of La Cygne, Kansas.
An autopsy was conducted but it didn't establish the cause of death. The FBI reopened his case in 2019 and last year they exhumed his body to see if it contained any new clues.
Nine months since his body was brought up from the ground for examination, authorities believe they have advanced the case.
Kansas Acting US Attorney Duston Slinkard said: "We knew that Alonzo Brooks died under very suspicious circumstances. This new examination by a team of the world's best forensic pathologists and experts establishes it was no accident. Alonzo Brooks was killed.
"We are doing everything we can, and will spare no resources, to bring those responsible to justice."
FBI Special Agent in Charge Timothy Langan added: "The FBI's commitment to justice remains at the forefront of each and every investigation.
"Our reach is broad, and the strength of our investigative tools are exceptional. We remain dedicated to uncovering the truth surrounding the murder of Alonzo Brooks and ensuring those responsible are held accountable for their actions."
Just before the Unsolved Mysteries reboot featured on Netflix, the FBI announced they would give US $100,000 to anyone who had information on Alonzo's death.
Producers of the show noted Alonzo's episode, 'No Ride Home' copped the most amount of tip offs.
Series' executive producer Terry Dunn Meurer told Variety: "Alonzo Brooks was probably [the case] we've received the most emails on. Lots of theories that we had already heard when we were producing the episodes, but there are some new names that have come in and that we forwarded onto the FBI.
"There were a lot of people there at that party, somebody witnessed what happened. We just hope that they'll come forward."
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