This one, I have no idea what happened. Steven Williams was the Orioles' 24th-round pick in 1987, out of Crescent City (FL) and made progress through the system: a year at Bluefield, a year at Erie, and by 1990 he'd reached full-season A ball, with Wausau in the Midwest League. His stats there were nothing amazing, but hardly awful (7-9, 4.16; 106/48 K/W ratio), and he'd started to make the transition to full-time starting, this being the first year the majority of his appearances hadn't come out of the pen. Still only 21 years old, and a lefty to boot, it seemed likely there would be more to Steve's story.
And yet…one relief appearance for Frederick in '91, and that was the end of that. I assume an injury, but I couldn't find any further info.