In "A Corpse in My Bed", Erik was originally gonna die and it'll be his final appearance because of it. Thankfully, Michelle Ziliak changed the ending instead; which is a good thing cause otherwise, it'll be much worse.
Music and Meta:
In one of their concerts, Curtis states that Erik was leaving the band for a couple of days, and he's pretty sad about it. In fact, you look closely, you can see that Erik is actually crying because of it.
While "A Gorey Demise" is a darkly funny song at the most part, most of the deaths are rather realistic and pretty depressing, and may bring bad memories to the sensitive.