Autopsy results were pending to determine what killed Twisted Method guitarist Andy Howard at his Cape Coral, Fla., home.

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The 23-year-old "had heart and lung problems," the band's manager told MTV.com Monday.

Howard was found dead Friday in his bedroom, Charlie Pennachio confirmed for the cable music channel. "We're not sure if it was drug-related or not," he added.

Twisted Method became known nationally when it went out with the 2003 OzzFest tour.

Howard announced in May he was leaving the group to spend more time with his newborn twin daughters and the band announced it was taking an indefinite hiatus in July.