due to "the unrefuted evidence" that Blankenship had "physically grabbed" May, had thrown food after she brought back the wrong fast-food order, and tore a tie rack and coat hanger out of a closet after she forgot to leave the hanger out for his coat. Blankenship's conduct, referred to as "shocking" by the court, contributed to their decision that May should get unemployment benefits as she was in effect fired because she was put in a position where she felt compelled to quit. Upper Big Branch explosion On April 5, 2010, an explosion at Massey's Upper Big Branch mine killed 29 miners. It was the worst U.S. coal mining disaster since 1970, when an explosion killed 38 in Hyden, Kentucky. NPR reported Massey executive Stanley Suboleski as saying that MSHA-ordered airflow changes, made hours before the explosion, "were changes the company opposed but complied with anyway." On April 12, New York State Comptroller Thomas DiNapoli, trustee of the New York State Common Retirement Fund which held 303,550 shares of Massey stock, called for Blankenship to resign immediately. "This tragedy was a failure both of risk management and effective board oversight. Blankenship must step down and make room for more responsible leadership at Massey." On April 22, Massey Energy's lead independent director Bobby R. Inman announced that "Blankenship has the full support and confidence of the Massey Energy Board of Directors." On April 25, President Barack Obama, Vice President Joe Biden, and state officials paid tribute to the 29 coal miners at a memorial service in Beckley, West Virginia. "Prosecutors said Massey manipulated the ventilation system during inspections of the Upper Big Branch mine to fool safety officials and disabled a methane monitor on a cutting machine a few months before the explosion on April 5, 2010.... In March 2013 Blankenship was directly implicated in conspiring to skirt safety regulations when a former Massey Energy official accused Blankenship of conspiring and plotting to hide safety violations from federal safety inspectors. The implication was that Blankenship would order his officials to warn mine operators when the federal inspectors were coming for "surprise" visits, and to quickly cover up any safety violations. Blankenship was convicted of a single misdemeanor charge of conspiring to violate federal mine safety standards and went on to serve a one-year prison sentence. He called himself a "political prisoner", feuded with United States Senator Joe Manchin and the Mine