BUENOS AIRES, Argentina (AP) — A medical examiner’s report into the death of Argentine soccer legend Diego Maradona injected uncertainty Monday into the criminal negligence case brought against eight medical workers involved in his case a month before they are set to stand trial for homicide.

A forensic expert conducted the study at the behest of one of the main defendants, Maradona’s neurosurgeon Leopoldo Luque, in an effort to challenge the 2021 medical examination that held Luque and other doctors responsible for what it described as the soccer star’s otherwise avoidable death. The defendants have denied any violations or irregularities in Maradona’s treatment.

Maradona, famous for leading Argentina to victory in the 1986 World Cup and back to the final four years later, died from a heart attack in 2020 while recovering from brain surgery.