Jóhann Jóhannsson's final film score, completed before his death earlier this year, will be released in September.

The soundtrack for horror film Mandy, which is directed by Panos Cosmatos and stars Nicholas Cage, is due to be released by Lakeshore/Invada. It was co-produced by Jóhannsson and Randall Dunn. and features Sunn O)))'s Stephen O'Malley on guitar.

"Jóhann went above and beyond, and I suspect to the limits of his sanity, to make the music for this movie," the film's director Panos Cosmatos says. "His words and his actions made him more than a great collaborator, they made him like a brother to me. I'm sad our time together was so brief but I'm very proud of what he accomplished on Mandy and I believe he was too."

The film itself follows the story of a man who hunts the religious sect responsible for killing his wife. The soundtrack for Mandy will be released on September 14.

Jóhannsson died in February aged 48. The cause of his death is still unknown.