The decade had also seen death and tragedy in country. Mindy McCready, a rising star of the late 1990s whose personal problems soon overshadowed her music, committed suicide during early 2013. Glen Campbell, a vastly influential country guitarist and vocalist from the 1960s onward, was diagnosed with Alzheimer's disease in late 2010 and consequently retired from show business in 2013; he died in 2017. Randy Travis, a neo-traditionalist star who helped revive the genre in the mid-to-late 1980s, had several run-ins with the law in 2012 and in 2013 suffered a massive stroke. Troy Gentry of Montgomery Gentry, one of the genre's most popular duos, was killed in a helicopter crash in 2017. Also in 2017, 58 concertgoers at the Route 91 Harvest festival event in Las Vegas, Nevada – where Jason Aldean was performing at the time gunfire broke out – were killed in a mass shooting; Aldean escaped the incident uninjured and a week later paid tribute to the victims on "Saturday Night Live".