His mother said she first heard a radio news report about the Monday accident, then three Marines arrived at her workplace to say her son was among the seven dead.

NPR: Profiles Of 7 Nev. Army Depot Explosion Victims

An upcoming concert tour also had to be canceled because of the 65-year-old singer's worsening medical condition, according to an ABC News radio report.

CNN: Singer Johnny Cash has Parkinson's disease

Pandora shares plunged nearly 20% this afternoon following a news report that Apple would release a competing online-radio product next year.

FORBES: Pandora Investors Singin' The Blues: Shares Plunge After Report Of Apple Radio in 2013