The Daily Mirror used the headline "'Rest in Puss" for a story about Casper the cat in the UK. He caught the same bus every day for four years, and it has been estimated that he clocked up 20,000 miles on his jaunts. Unfortunately he was recently killed after being hit by a car while walking across the road to get to the bus stop. The headline is a play on the phrase "Rest in Peace", which is often found on headstones used to mark graves. Rest in Peace is often abbreviated "RIP."
More Life and Death vocabulary here.