Television's former child star Lauren Chapin has passed away. The actress's family shared an emotional tribute — and a deeply personal detail about her final chapter.

For many millennials, though, Robert will always be Sam McGuire: Lizzie McGuire's lovable, steady dad on the Disney Channel hit show.

Following the announcement that Robert died by suicide after his 20-year battle with bipolar disorder, the "Lizzie McGuire" cast shared their heartbreak and remembered his "constant fatherly like [sic] support" on set, according to Deadline.

And perhaps the tribute that hit fans the hardest came from the show's main character herself. In one of the photos Hilary Duff shared, the McGuire family beams together in their sitcom kitchen, Robert smiling warmly beside his on-screen wife and kids.

The cover image is a close-up of Hilary and Robert, both flashing bright smiles that now feel especially bittersweet. In her emotional caption, the actress didn't hold back her heartbreak.

"This one hurts. It's really hard to face this reality about an old friend," she penned. "There was so much warmth in the McGuire family and [sic] I always felt so cared for by my on-screen parents. I'll be forever grateful for that." Then came the line that may have stunned many:

"I'm deeply sad to learn Bobby was suffering."

"My heart aches for him, his family, and everyone who loved him," Hilary Duff added, punctuating the tribute with a broken heart emoji.

Robert is survived by his children, grandchildren, brothers, nieces, nephews, and countless loved ones who considered him family.