I think all these wrestling deaths are as much if not more so related to their hard living lifestyle than steroid use itself.
They are on the road for 250+ nights a year, their bodies get pounded all 250 nights, even though the outcomes are pre-scripted, you can't fake the damage that those impacts, hitting the concrete floor, getting hit with a chair, or just having your body flying around night in and night out.
Their bodies just get destroyed on the road, so to take the edge off, and make the pain go away they start drinking, they start taking painkillers, they start doing drugs etc....
It's a viscious cycle. Being a pro-wrestler is a hard life to live, and not many can do it. They risk their bodies inside and outside the ring. But they are well paid for it, and some wrestlers like say Kevin Nash, Hulk Hogan, Ric Flair, etc... can handle it. Others can not.
However, they are adults and there is no slavery, they are chosing to do what they do, and take the risks involved.
This is one of the reason's why Owen's death is so sad. From all accounts, he was a family man, he didn't live the hard lifestyle, he wouldn't drink and do drugs with the rest of the boys, he was frugal, didn't piss away his money, he did everything right. But in the end pro-wrestling took him too.
I'd be interested to see the overall average life expectancy of a pro-wrestler. If a normal american male lives to be 78 or so, I bet wrestlers have on average a good 10-20 years less than that.