Very sad for someone so young. My first thought was that something else was involved in this death other than having a few drinks. It is so easy to assume the worst when it could have been vomit aspiration, undetected heart problems like sarzy said or any other natural causes. I don't know if SG had any sort of drug habit. It is sad that we (and I include myself in that) become so used to stars hiding things when maybe an individual really did die of natural causes. It's unusual but not impossible but it doesn't really change anything.
Eternal rest for Stephen and prayers to his family, friends and partner.