No, I’m not looking for help in getting away with murder. I’m plotting out a historical mystery, in which my victim must (must) die of a heart attack but where my sleuth suspects nefarious play. What causes (probably drugs) would he be suspecting? It’s not a major issue in the book, so I won’t need a lot of technical details, but I’ll need something tangible when my character kicks off, about fifty pages from now.
Since my book takes place in the fall of 1940, it would need to have been available then, whatever it is.
The victim is in his mid-40s, has some history of heart problems (one previous heart attack), is a heavy drinker.