Renowned comic artist John Cassaday has passed away at the age of 52 due to complications related to a brain condition, as confirmed by his sister Robin on Facebook. Cassaday was hospitalized in the ICU last week, where his health deteriorated despite his organs functioning normally. He is best known for co-creating the critically acclaimed series Planetary with Warren Ellis and illustrating Astonishing X-Men under Joss Whedon, earning multiple Eisner Awards for his work. His artistic talent was praised for its detail and design, contributing significantly to the comic book industry. Tributes from fellow artists and writers, including Mark Waid, highlight his kindness, friendship, and influence on the medium. Cassaday's legacy will continue through his impactful body of work in the comic community.