Grateful Dead Co-Founder, Singer-Guitarist Was 78

Singer-songwriter-guitarist Bob Weir, a cornerstone of the Grateful Dead and the San Francisco psychedelic band’s many latter-day offshoots for more than half a century, has died after a long battle with cancer and lung issues, according to a social media post from his family. He was 78. 

The post said that Weir had been diagnosed last summer and began treatment three weeks before…