Marque "Tate" Lynche, a former cast member of The All new Mickey Mouse Club, died Sunday. He was 34.

Lynche starred on the beloved Disney Channel variety show alongside Justin Timberlake, Britney Spears, Christina Aguilera and Ryan Gosling, and was a Mouseketeer from 1993 to 1995.

PHOTOS: Stars We've Lost In Recent Years

Lynche was found dead in his New York City apartment, according to the New York Police Department. His body was discovered by his roommate at 4 p.m. Sunday afternoon, The Wrap reports. Police are currently investigating, and are waiting for the medical examiner's report to determine the cause of death.

Lynche, who went by Tate while appearing on The All New Mickey Mouse Club, also competed on season three of American Idol in 2004.

After news of his death broke, several former co-stars took to social media to share their memories and condolences.

American Crime Story actor Dale Godboldo, who appeared alongside Lynche on MMC, wrote on Facebook, "I spoke with Marque a few months ago, and his spirit was as beautiful as ever. Love and prayers to your family. RIP my man. You will be missed."

Damn. I spoke with Marque a few months ago, and his spirit was as beautiful as ever. Love and prayers to your family. RIP my man. You will be missed 󾍛🏾

Posted by Dale Godboldo on  Monday, December 7, 2015

Actress, model and former Mouseketeer Rhona "Miss R&B" Bennett also took to Facebook to remember her former co-star.

"Today, we mourn and acknowledge the loss of the first from our Mouseketeer clan," Bennett wrote. "We're not exactly sure what has happened to our brother yet, however, so much love is being sent out to his family, friends and those who cared for and loved him."

Today, we mourn and acknowledge the loss of the first from our Mouseketeer clan. We're not exactly sure what has...

Posted by Rhona Bennett (Miss R&B) on  Monday, December 7, 2015

Former co-star Jennifer McGill shared a throwback photo of a young Lynche's signed headshot, which she captioned, "A mouseka-brother passed away this weekend & most of us are finding out today. I'm in shock."

WATCH: Flashback! 17-year-old Britney Spears Talks Mickey Mouse Club in First ET Interview!