Danny Tamberelli Writes Heartbreaking Tribute to “Adventures of Pete & Pete ”Costar Michelle Trachtenberg After Her Death

Former Nickelodeon star Danny Tamberelli remembered his The Adventures of Pete & Pete costar Michelle Trachtenberg in an emotional Instagram post.

“We grew up learning how to make people laugh together,” Tamberelli, 43, wrote alongside photos of them from the show and behind the scenes. “More importantly, we learned to make each other laugh and pull pranks on everyone. We were doing improv when it was still called playing pretend to get laughs.”

He said of Trachtenberg, who died at age 39 on Wednesday, Feb. 26, “She was a master of the clothespin game, tagging any and everyone she could. She once got upset when I got my 1st bass on set because I wouldn’t hang out during lunch. She hid the cable so I couldn’t play through the amp. I got the message.”

“She was a bright light, firecracker and caring person who spent a lot of time and effort advocating for people who needed a louder voice,” he said. “Michelle was someone to look up to in this business and to the general world at large. She will be missed. All my love, sympathy and compassion to [her mother] Lana, [her sister] Irene and the rest of her family and friends.”

Related: Michelle Trachtenberg's Life in Photos

Trachtenberg joined The Adventures of Pete & Pete during the show’s second season. Her part as Nona F. Mecklenberg was her first major role. Nona was a sidekick for Tamberelli’s Pete, the younger of the Pete brothers. The older Pete was played by Michael C. Maronna. The Adventures of Pete & Pete ran from 1993 to 1996 on Nickelodeon.

Trachtenberg often appeared on Nickelodeon in her early career, including in an episode of Clarissa Explains It All, in the game show Figure It Out and in an episode of Blue’s Clues. Her first major film, Harriet the Spy, was also produced by the network. Tamberelli was also one of Nickelodeon’s most frequent stars and was part of the ensemble of the kids sketch series All That and also appeared on Figure It Out.

Related: Michelle Trachtenberg Said Rosie O'Donnell 'Protected Me So Much' on Set of Harriet the Spy

Trachtenberg was found "unconscious and unresponsive" by police on the morning of Feb. 26. A cause of death has not been confirmed, though she recently underwent a liver transplant, sources confirmed to PEOPLE.

After her Nickelodeon days, Trachtenberg went on to star as Dawn in Buffy the Vampire Slayer, as Georgina Sparks in Gossip Girl and as Casey in Ice Princess, among other roles. Trachtenberg’s Buffy costar Sarah Michelle Gellar remembered her in a tribute post, writing, “Michelle, listen to me. Listen. I love you. I will always love you," a reference to the season 5 finale episode of Buffy in which Buffy sacrifices herself for Dawn. "The hardest thing in this world, is to live in it. I will be brave. I will live… for you."

Related: Kim Cattrall, James Marsters, Kenan Thompson and More Stars React to Michelle Trachtenberg's Death: 'RIP Sweet Beauty'

Her Gossip Girl costar Blake Lively wrote on Instagram of Michelle, “She was electricity. You knew when she entered a room because the vibration changed. Everything she did, she did 200%."

Lively continued, "She laughed the fullest at someone's joke, she faced authority head on when she felt something was wrong, she cared deeply about her work, she was proud to be a part of this community and industry as painful as it could be sometimes, she was fiercely loyal to her friends and brave for those she loved, she was big and bold and distinctly herself."

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