Here's what I found in a quick search. These are just Steeler's linemen from the 70's and early 80's:
Ray Mansfield - 55 y/o Massive coronary artery and fatal clot; died while hiking in Grand Canyon
Tyrone McGriff - 42 y/o Heart Attack
Steve Furness - 50's Heart Attack
Mike Webster - 50 y/o Brain Damage?
Jim Clack - 58 Heart Failure, battled Neck & Throat cancer for 4 years before death
Terry Long - 45 y/o suicide, drank antifreeze. Had attempted suicide before after being suspended by NFL for Steroid use. Also suspected brain damage.
Again, there is no emprical evidence that steroid use caused or sped the deaths of these men. As a matter of fact, there may actually be more evidence for several that brain damage had a closer relationship to their deaths. Intersting nevertheless.