Among other substances in Hawkin's system there were benzodiazepines and opioids found. As we have seen in the past mixing benzos with opiates can be a deadly combination.
https://www.buzzfeednews.com/article/stefficao/taylor-hawkins-foo-fighters-dies
https://deadline.com/2022/03/taylor-hawkins-death-details-colombian-authorities-1234987548/
Foo Fighters’ drummer Taylor Hawkins had 10 substances in his system at the time of his death, according to a “forensic medical study,” the results of which were released Saturday by Colombia’s Attorney General’s Office, CNN reports.
The substances detected by a urine toxicology test include THC, tricyclic antidepressants, benzodiazepines and opioids. The forensic investigation is ongoing.