The disappearance of a rocket scientist has taken a chilling new turn after it emerged she holds a one-of-a-kind patent tied to advanced US launch systems. Monica Jacinto Reza, 60, was last seen hiking in the rugged San Gabriel Wilderness area in the Angeles National Forest on June 22 last year. Reports ... indicated that a man walking about 30ft ahead of Reza on the trail to the Waterman Mountain summit turned around moments later and discovered she had vanished without a trace. Records show she is the only surviving co-creator of a 2010 patent filed with Dallis Ann Hardwick, who died of cancer in 2014, for a specialized metal designed to resist burning while remaining incredibly strong under extreme heat. She was also credited as a co-inventor of Mondaloy, a nickel-based superalloy later used in key components of advanced propulsion systems developed through US Air Force and NASA-backed research programs. Reza spent decades working at Rocketdyne, later part of Aerojet Rocketdyne, a major aerospace contractor involved in government propulsion programs, while retired US Major General William Neil McCasland, who oversaw related Air Force research portfolios, also went missing in June 2025. Reza and McCasland are among nine recent cases involving scientists with ties to aerospace, defense or nuclear research whose deaths or disappearances have drawn public attention.