Ric Parnell, the British musician best known for playing doomed drummer Mick Shrimpton in Rob Reiner’s cult-classic heavy metal mockumentary This Is Spinal Tap, has died at age 70. The news was confirmed Sunday on social media by comic actor Harry Shearer, aka Spinal Tap’s Derek Smalls, who said “no one ever rocked harder” than Parnell. No cause of …