There probably are but I cannot think of anyone specific off the top of my head. I know the one time I tried opioids (WAY before I knew about SaSu) it "should have" worked. I worked for a medical malpractice firm and we had a case where the family sued a doctor when their loved one died of an overdose -- this was back when doctors prescribed opioids like they were handing out Skittles. So I had seen the blood and autopsy reports, and saw the guy's prescription records, as well as his pre-existing conditions, yada yada yada.
Anyway, I managed to gather up as many milligrams as he had in his system, the additional amount (in milligrams) that was in his stomach still undigested, along with a bottle of Jack Daniel. I was not a recreational drug user, nor drinker -- except for the occasional glass of wine when we went out with friends, and though I was not completely opioid naive I was not heavily dosed by any stretch of the imagination. In fact other than a 5mg pill for break-thru pain (maybe a couple times a month) when my migraine meds didn't work, I didn't use pain meds.
Anyway, I waited until my husband left for work, sat down on the sofa, turned on The Big Lebowski and started taking pills and washing them down with Jack. I came to on the sofa the next morning -- all the pills were gone (so I must have taken them), along with half that fifth and I don't think I have ever been so disappointed in my life as I was when I realized I was still here. It SHOULD have worked. I didn't throw up, I know my husband didn't take the pills that would have been left if I hadn't finished them because the bottle of Jack was still there. In fact he never said a word about my attempt.

That was how little he cared. My best guess is, if he even checked at all, that when he came in from work the next morning, he was disappointed that I still had a pulse, and just went to bed hoping maybe my body would shut down before he woke up.
Anyway, the only thing I accomplished was giving myself a MASSIVE headache and sore neck -- guess sleeping sitting up on a sofa will put a kink in your neck if you sit "just right".
So, while people do die from ODs it is a horribly unreliable way to try. It is really a shame that it isn't socially acceptable to actually allow people to make their own decisions when it comes to when they want to leave this world.