In July 2009, he and fellow band member Ryan Ross left Panic! citing creative differences and formed another band, The Young Veins.
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Walker was with Panic! when they won the video of the year award at the 2006 MTV Video Music Awards for their song "I Write Sins Not Tragedies", although he had not recorded the song with the band nor did he appear in the video.
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Ross appeared along with former bandmates Brendon Urie, Spencer Smith, and Jon Walker in the Gym Class Heroes music video for the song "Clothes Off!!".