Book excerpt: Black Tooth Grin is the first biography of "Dimebag" Darrell Abbott, the Texas-bred guitarist of the heavy metal band Pantera, who was murdered onstage in 2004 by a deranged fan-24 years to the day after John Lennon met a similar fate.Darrell Abbott began as a Kiss-inspired teenage prodigy who won dozens of local talent contests. With his brother, drummer Vinnie Abbott, he formed Pantera, becoming one of the most popular bands of the '90s and selling millions of albums to an intensely devoted fan base. While the band's music was aggressive, "Dime" was outgoing, gregarious, and adored by everyone who knew him. From Pantera's heyday to their implosion following singer Phil Anselmo's heroin addiction to Darrell's tragic end, Black Tooth Grin is a moving portrait of a great artist.