From this post it will be clear that
I passed on the Roseanne show the first time around,
or else the following would not have been news to me.

Glenn Quinn was a Dublin native who died of a heroin overdose.
His acting career took him to US network television.
Had I watched "Roseanne", I would have seen him.
As it was,
I remember him from the first season of "Angel,"
the "Buffy the Vampire Slayer" spinoff.
His character was killed off in the first season,
which is kind of tough luck for an actor.

The Roseanne actors who are veterans from the first season
have been outspoken about their memories of Glenn Quinn lately.
As for me, I recall "Angel" lead actor, David Boreanaz,
reminiscing about Glenn Quinn.
Boreanaz was there for Quinn's live audition and he recalls
that Quinn was so very funny that it broke him up,
and Boreanaz is a true professional, he would not easily crack up laughing.

After Quinn's sad demise,
Boreanaz allowed that he has never come to terms with the loss.