Music producer Sidney “Omen” Brown — who collaborated with superstar artists such as Ludacris , Drake and Beyoncé — was found dead in his New York City apartment, leaving loved ones stunned by the hitmaker's sudden passing, officials said Tuesday.

The 49-year-old Brown's "cause and manner of death are pending further study," according to a statement by the city's Office of Chief Medical Examiner.

Brown, who was usually known by the moniker "Omen," missed his gig as a DJ at Barawine Harlem, prompting family members to go to his East Harlem apartment on Saturday. It was there where they made the sad discovery, sister Nicole Iris Brown, 43, told NBC News.

"He was holistic and healthy. So we don't know of him being sick, so this is all pretty sudden," his sister said.

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