Jane Lynch and Matthew Morrison were some of Mark Salling’s Glee co-stars that sent their condolences after he died today at the age of 35.

In a video on TMZ, Lynch said that she that Salling’s death was “tragic” and that she was “broken-hearted.” She said she will remember him “as the guy who made that who made that sweet video at the beginning of Glee when he was so happy to be part of this group.”

Morrison, who played Salling’s teacher Mr. Shuester posted an image on Instagram of him, Salling and Cory Monteith, who died in 2013. Glee director Paris Barclay tweeted an image of him with Salling and Monteith on set with the caption, “It’s a painful loss, again. Two young actors, lost too soon. RIP #marksalling.” Glee co-star Jenna Ushkowitz retweeted Barclay’s pic.

Other Glee colleagues Tim Davis and Iqbal Theba also took to Twitter to express their reactions.

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The news comes just more than a month after Salling pleaded guilty to a federal offense of possessing child pornography, and ahead of a scheduled March 7 date for his sentencing. Salling’s death is being investigated by authorities as a possible suicide, and the coroner’s office is waiting to inform his next of kin and family members. His body was found near his home in Sunland, in northern Los Angeles.