The medical examiner has ruled his manner and cause of death as "undetermined."
In an update on Wednesday, Houston police told ABC13 that Adamson's autopsy showed no signs of trauma that would have caused his death and toxicology results indicated there were drugs in his system.
On the morning of July 19, 2022, HPD officers responded to reports of a body found in a roadside ditch at the 8900 block of Brae Acres Road.
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The video above is from a previous report.
Police said they are still trying to figure out who wrapped Adamson's body and put it in a ditch, but their leads have now gone cold. The case remains open.
After the discovery, little-to-no information was released on this case. And in later months, Adamson's mother pleaded for justice.
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"He didn't wrap himself with duct tape and a blanket and dump himself in a ditch. And those responsible need to pay for it," Kathleen Strole, the victim's mother, told ABC13 in an August 2022 interview. "I need answers. I've got to have closure. I've got to know one way or the other what happened."
With a year passing, Strole says she's going to continue pushing for answers.
NOTE: A spokesperson with HPD initially told ABC13 that Adamson's cause of death was ruled an overdose, but in an update on Wednesday, the department said his manner and cause of death were still "undetermined." This post has been updated to reflect the change in information from HPD.