I don't think in and of itself cannabis can kill you, I think it can be a third party factor in most deaths.
So I believe you could be high and get in a car or something and have an accident or maybe it's taken people to bad places mentally (I've had some bad experiences with edibles, I know it can freak you out) and the METRO posted today that someone was so high on cannabis they thought they were having a heart attack which brought on an actual heart attack.
Two points here, first and foremost it's the METRO so make of that what you will, most mainstream media websites will sensationalise especially when it comes to cannabis and finally even if it were true it wasn't the cannabis directly that caused the heart attack, it was the panic attack brought on by being high,
So yea, as far as I'm aware there's no recorded deaths caused by cannabis, now everything in extreme excess has the potential to be deadly so it wouldn't surprise me if it were possible BUT I'm guessing to consume the amount that is possible to kill you would be near impossible.
Just like you can die from drinking too much water too fast, your body will try and purge that long before you get to a deadly state.
Short answer, it would be way too much hassle, seek out another method because nobody is going to be able to give you any definitive answers when it comes to this.