He was 48.
In a statement, his agency Gorfaine-Schwartz said: "We are deeply saddened by the sudden loss of our client and dear friend Jóhann Jóhannsson, whose great talent, humility and kindness enriched our lives immeasurably. His music has inspired many new generations of filmmakers and composers. He will be so greatly missed by his Gorfaine/Schwartz family as well as the entire film music community."
Johannsson, who died on Friday, often blended electronics with conventional orchestra.
His most recent score is "Mary Magdalene" with Rooney Mara for director Garth Davis, which is slated to release here in March.
Jóhannsson is survived by his parents, a daughter and three sisters.
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