I'm interested in this as well.

So far, all I've found is some research that artificially lowering LDL or raising HDL may not show clear correlation to lower heart disease risk- not quite the same thing as saying LDL isn't generally correlated to heart disease risk:

Broad overview:

  https://www.scientificamerican.com/article/cholesterol-conundrum/

Studies references (but not cited) in the article above:

  http://www.nejm.org/doi/full/10.1056/NEJMe0801608

  http://www.nejm.org/doi/full/10.1056/NEJMoa1107579