Through the people I know, I have only heard of one heroin overdose death (and it was a mix with another drug). I have heard of multiple OD’s from pills, including one fresh from his first prescription from the hospital (technically, it was the liquid version prescribed, not the pill, but in this case, it was legal, accidental, and more likely more pain killer than he needed for his condition).
I've only heard personally about two OD deaths, but times it was prescription barbiturates in combination with alcohol.