I saw on the news last night that they haven't determined cause of death yet, he was found in his car at his office. Toxicology could take a few weeks. Thoughts go to his family, I can't imagine the level of grief losing 2 so quickly.
Presumably self-medicating to deal with the trauma of his daughter's suicide. I absolutely hated his TV ads but I can't begin to imagine the pain he was dealing with. There are some things money doesn't solve and the death of a child has got to be at or near the top of that list.
Cocaine doesn't kill you in a couple of days. Over time, it does rewire the brain. I suspect he has been using for a long time.
What makes you think the father's use of Cocaine didn't have an effect of the daughter's suicide? Couldn't the opposite also be true?