Rock legend Ozzy Osbourne has expressed his shock at the death of guitarist "Dimebag" Darrell Abbott, who was shot at a concert on Wednesday.
Darrell Abbott was shot at several times
Former Pantera star Abbott was one of five people killed in Ohio as his band Damageplan took to the stage.
Black Sabbath frontman Osbourne, who often toured with the 38-year-old, said: "I'm absolutely beside myself with grief.
"I can't for the life of me understand why someone would do this."
Abbott and three others were shot when a man stormed the stage at the Alrosa Villa Club in Columbus and began firing at the band and crowd.
Nathan Gale, 25, was then shot and killed by a police officer who arrived shortly after the first shots were fired.
The other men killed were named as club employee Erin Halk, 29, fan Nathan Bray, 23, and Jeff Thompson, 40, who was affiliated with the band.
Ozzy Osbourne often toured alongside Pantera
Two other people were taken to hospital following the incident but their condition is unknown.
No motive has yet been established for the rampage, although Sgt Brent Mull said witnesses had described hearing Gale accuse Abbott of being behind the split of the Grammy-nominated heavy metal band Pantera.
Floral tributes have been laid outside the concert venue as fans pay their respect to the guitarist and the others who died.
A candlelit vigil was also held outside the Machine Shop in Flint, Michigan, where Damageplan had been due to perform on Thursday night.
Rock world stunned
The hard rock world has been left stunned by the killings. The metal band Drowning Pool cancelled its tour as a mark of respect.
"No one knows why some people do the heinous things they do," the band said in a statement.
"Dimebag Darrell was the epitome of rock and roll. He wasn't just a player that all guitarists aspired to be, but the genuine article and a true friend."
Chimaira lead singer Mark Hunter said
Abbott "changed the way metal music was written with his guitar playing".
"I don't know anybody in a band who hasn't
stolen a few guitar riffs from him," he added.
Damageplan were formed in 2003 by guitarist "Dimebag" Darrell and drummer brother Vinnie Paul after their former band, Pantera, split up.
Pantera were one of the most popular metal bands of the early 1990s, topping the US album charts and getting a Grammy nomination for 1994 release Far Beyond Driven.
The pair were joined in Damageplan by singer Pat Lachman and bassist Bob "Zilla" Kakaha.