The investigation would mandate autopsies for anyone who dies within two weeks of a Covid vaccination. From Ethan Huff at naturalnews.com:

(Natural News) Following the discovery that upwards of 30 percent of all deaths that he and his team have evaluated are linked to covid “vaccination,” Bundestag (German federal parliament) vice president Wolfgang Kubicki is calling for a full investigatory autopsy to be conducted on all deceased who died shortly after getting the needle.
All unexplained deaths that occur within 14 days post-injection need to be looked at with a fine-toothed comb, Kubicki argues. He wants all such cases to also be automatically registered as a suspected covid jab-related case with the Paul Ehrlich Institute (PEI).
Investigating a “link between vaccination, myocarditis, and death is imperative,” the Free Democratic Party (FDP) politician said.
In a speech, Kubicki referenced a recently published study by Peter Schirmacher, the chief pathologist at the Heidelberg University Clinic. That study, mentioned earlier, found that at least 30 percent of all deaths are now occurring not long after the deceased got “vaccinated” for covid.
“We are talking about a relevant number that makes it necessary to approach this problem systematically,” Kubicki said, adding that health authorities need to “regularly” conduct autopsies on all people who die within two weeks of injection.
“That also makes sense because the conditional approval of these vaccines took place under enormous time pressure,” he added. (Related: Earlier this year, German Dr. Sonja Reitz pegged covid jabs as the cause of her country’s “excess death” problem.)