Grimlock

So, did Grimlock really go crazy and off himself like Overlord stated in LSotW? Or was he just blowing hot air out of his afterburner?
I ask because I can't remember if he's been mentioned since and I really find that it was an unfortunate way for him to go (if it's actually true). He's kind of like the Wolverine of the TF world and I know Marvel would never kill Wolvie off with a "Oh yeah... by the by, he's dead. Went mad. Killed himself. The end."
Thoughts? Theories?
I ask because I can't remember if he's been mentioned since and I really find that it was an unfortunate way for him to go (if it's actually true). He's kind of like the Wolverine of the TF world and I know Marvel would never kill Wolvie off with a "Oh yeah... by the by, he's dead. Went mad. Killed himself. The end."
Thoughts? Theories?