Lance Reddick's family has disputed the actor's cause of death after his death certificate listed it as down to ischemic heart disease and atherosclerotic coronary artery disease.
The Wire star died on March 17 at the age of 60 with his representatives stating at the time that it was down to natural causes.
Reddick's death certificate was shared by TMZ on Thursday in which the apparent cause of his death was listed.
However, the John Wick star's family has since disputed the cause of his death, claiming the conditions were "wholly inconsistent" with Reddick's lifestyle.
Reddick's attorney James Hornstein told People in a statement: "I have represented Lance Reddick for many years and continue to represent his wife Stephanie. The coroner statement on the death certificate is not a result of an autopsy.
"No autopsy was performed on Lance. To my knowledge, no medical examination of Lance during his lifetime ever indicated such conditions."
He added: "Lance was the most physically fit person I've ever known. He exercised daily at his home gym, including extensive cardio work, and the availability of gym facilities was a contractual requirement for his work away from home. He ate as if a dietician was monitoring his every meal.
"The information appearing on the death certificate is wholly inconsistent with his lifestyle."
The statement concluded: "On behalf of Stephanie Reddick, the death certificate information is not corroborated and is inconsistent with the facts known to the family."
Hornstein did not comment on TMZ's reports that the actor is set to be cremated.
News of Reddick's death had rocked fans and colleagues after his reps shared a statement last month confirming: "Acclaimed actor Lance Reddick passed away suddenly this morning from natural causes.
"Lance was best known for his roles in The Wire, Bosch, Netflix's Resident Evil and the John Wick films. He is survived by his wife Stephanie Reddick and children Yvonne Nicole Reddick and Christopher Reddick. Lance will be greatly missed. Please respect his family's privacy at this time."
His death came during the promotional run for the latest installment in the John Wick franchise and the actor had several other projects in the pipeline, including playing Zeus in 2024's Percy Jackson and the Lightning Thief, the reboot of White Men Can't Jump, and the John Wick spinoff Ballerina among others.