The nearly 50-year-old mystery of the 'Pinnacle Man,' who was found frozen in a Pennsylvania cave in 1977, has been solved. Authorities identified the man as 27-year-old Nicholas Paul Grubb from Fort Washington, Pennsylvania. His death was ruled a suicide from a drug overdose, with no signs of foul play. The breakthrough came when Pennsylvania State Trooper Ian Keck discovered the misplaced fingerprint card from Grubb's 1977 autopsy in August 2024, which was subsequently matched by an FBI fingerprint expert. The case had baffled investigators for decades despite periodic reviews and the use of dental records and DNA samples. Grubb's family is now working to have his remains returned to them for burial in their family plot.