2:57 PM PT -- Jack Black says he's devastated and heartbroken by Kevin's death, saying he died way too young.
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JB is remembering Kevin as a "beautiful soul" and says they had tons of great memories together. Jack's also sending love to Kevin's family and the whole 'SoR' community.
"School of Rock" star Kevin Clark, who played the drummer, is dead after a motorist hit him while he was cycling around Chicago ... TMZ has learned.
The professional drummer -- best known as Freddy Jones, aka Spazzy McGee -- was riding his bicycle on the Northwest Side of Chicago early Wednesday morning when he was struck by a Hyundai Sonata ... according to police.
Kevin was rushed to a hospital, but was pronounced dead at 2:04 AM CT ... according to the Cook County Medical Examiner.
Kevin's sister says he was riding his bike home at the time of the accident. Police say a 20-year-old woman was driving the car that struck and killed Kevin. She was not arrested, but has been issued citations.