Mark Salling, who played Noah ‘Puck’ Tuckerman on the E4 show, died aged 35.
He was awaiting sentencing after pleading guilty to possession of child pornography.
The actor previously entered a guilty plea after 50,000 images of sexual abuse victims were found in his possession.
The victims in the shocking images are said to be ages three to five years old.
Tim Davis, a producer on the musical comedy, tweeted: “Today we lost another #Glee cast member.
“Yes, he committed crimes against children. Yes, it’s horrific. But #MarkSalling was a broken man, no doubt an abuse victim himself.
“I loved Mark, and am sad when I consider the devastation of his parents. PLEASE withhold your cruel comments.”
Jane Lynch, who played Sue Sylvester on the show, retweeted a second statement he put out to his 68k followers.
“Let me be clear, having compassion for #MarkSalling in no way minimizes his crimes, nor does it minimize the pain and devastation of the victims of those crimes (sic),” he wrote.
“I’m just saying stop adding to his family’s pain. This was their son. If you’re without sin, feel free to cast stones.”
Matthew Morrison, known for his role of Will Schuester on Glee, also paid tribute on his Instagram page.
He shared a picture of him standing between Mark and Cory Monteith, who died in 2013 aged 31 following a drug overdose.
He captioned the picture with a sad emoji between two angel emojis.