Johann Johannsson, an award-winning composer and producer who combined classical sounds and modern electronics on the acclaimed soundtracks to “The Theory of Everything” and “Sicario,” was found dead Feb. 9 in his Berlin apartment. He was 48.

His manager, Tim Husom, announced the death. Further details were not available.

Rosalie Voss, who runs the European office of Redbird Music, told the Associated Press that the cause of death was unknown and that police were investigating.

A native of Reykjavik, Iceland, who started out as a rock guitarist, Mr. Johannsson won a Golden Globe and received Grammy and Oscar nominations for his score for “The Theory of Everything,” the 2014 film starring Eddie Redmayne as physicist Stephen Hawking.

Mr. Johannsson also received an Oscar nomination for the 2015 movie “Sicario.” His score for “Arrival,” a 2016 release, brought him Golden Globe, BAFTA and Grammy nominations. Last year, he worked with Darren Aronofsky on “Mother!”, which stars Jennifer Lawrence.

Johannsson also recorded several albums of his own, including “Fordlandia” and “Orphee.”

Survivors include a daughter.

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