Heavy metal band Twisted Sister canceled its 50th anniversary reunion shows on Friday after lead singer Dee Snider resigned, citing health issues.  The band posted on social media saying the "sudden and unexpected resignation" of Snider has forced them to cancel all shows starting from April through the beginning of the summer. "The future of Twisted Sister will be determined in the next several weeks," the band said.  Snider said in a statement that at 70 years old, he's found his body can "no