Aerospace Engineer’s Metal Key to Rocket Technology | Monica Reza

The Disappearance of William McCasland and the Lingering Mystery of Monica Reza

The search for William McCasland, a former colleague of aerospace engineer Monica Reza, has brought renewed attention to Reza’s own unsolved disappearance. McCasland’s case, unfolding now in March 2026, echoes the circumstances surrounding Reza, who vanished in June 2025 while hiking in the Angeles National Forest. Both individuals, it appears, were connected through their work in advanced aerospace technologies, raising questions about potential links between the two cases. The focus on McCasland’s whereabouts is prompting investigators to revisit details surrounding Reza’s disappearance, a case that initially appeared to be a tragic hiking accident but now carries a more complex weight.

A Shared World of Advanced Alloys and National Security

Monica Jacinto Reza’s story, as detailed in reports from TheSentinel and newsnationnow.com, is far from a simple missing person case. Reza wasn’t just a hiker; she was a pivotal figure in the development of Mondaloy, a family of nickel-based superalloys crucial for modern rocket engine construction. She co-invented the alloy and held the patent, a technology now vital for replacing Russian-made rockets used for American national security launches. TheSentinel highlights the significance of her work, noting her decades-long career as a Technical Fellow at Aerojet Rocketdyne – the highest technical rank within the company – and her subsequent role at NASA’s Jet Propulsion Laboratory (JPL). This background elevates her disappearance beyond a local tragedy and into the realm of national security concerns.

The Last Known Sighting and Initial Response

On June 22, 2025, Reza was hiking in the Angeles National Forest with a companion. Reports indicate she was approximately 30 feet behind him when she waved. That wave is the last confirmed contact anyone had with her. The initial response followed standard protocol: news outlets reported a missing hiker, emphasizing the rugged terrain and requesting the public to check security camera footage. However, the significance of Reza’s professional life remained largely unreported at first. The Los Angeles County Sheriff’s Department led the search, but after several days, the focus shifted to recovery rather than rescue.

Eight Months Later: A Parallel Disappearance

What sets Reza’s case apart is the subsequent disappearance of a general who had funded her work, occurring eight months after she vanished. This connection, as reported by TheSentinel, has fueled speculation and prompted a deeper investigation into potential foul play. While the details of the general’s disappearance remain separate, the timing and professional link to Reza are undeniable. The fact that the helicopters continued searching for Reza even after she was declared dead adds another layer of intrigue to the case.

Confirmed vs. Unclear: Separating Fact from Speculation

Here’s what is definitively known, and what remains unclear regarding both cases:

• Confirmed: Monica Reza disappeared on June 22, 2025, while hiking in the Angeles National Forest. She was a highly accomplished aerospace engineer and co-inventor of Mondaloy.
• Confirmed: A general who funded Reza’s work disappeared eight months after her disappearance.
• Confirmed: William McCasland, a colleague of Reza, has recently gone missing.
• Unclear: The circumstances surrounding Reza’s disappearance. While initially treated as a hiking accident, the possibility of foul play is now being investigated.
• Unclear: The nature of the connection between Reza’s disappearance and the general’s disappearance.
• Unclear: The connection between McCasland’s disappearance and Reza’s case.
• Unclear: The specific details of McCasland’s work and his relationship with Reza.

The Significance of Mondaloy and the Rocket Industry

Mondaloy isn’t just another metal; it’s a critical component in the next generation of American rockets. As SpaceNews and other industry publications have reported, the US has been actively working to reduce its reliance on Russian-made rocket engines. Mondaloy provides a domestic alternative, bolstering national security and independence in space exploration. Reza’s expertise in this area made her a valuable asset, and her disappearance raises concerns about potential intellectual property theft or sabotage. The patent she held for Mondaloy, documented in Google Patents (US 2010/0266442 A1), underscores the importance of her work.

What Happens Next?

The renewed focus on William McCasland’s disappearance is likely to trigger a re-examination of the evidence in Monica Reza’s case. Investigators will likely explore any potential connections between the two individuals, their work, and any shared contacts. The Los Angeles County Sheriff’s Department will likely face increased pressure to release more information to the public, particularly regarding the circumstances surrounding Reza’s death declaration and the investigation into the general’s disappearance. Given the national security implications, it’s possible that federal agencies, such as the FBI, could become more involved in the investigation. The search for McCasland will proceed concurrently, with investigators hoping to uncover clues that might shed light on both cases.

As the search for McCasland continues, the lingering questions surrounding Monica Reza’s disappearance serve as a stark reminder of the hidden complexities that can lie beneath seemingly straightforward cases. The intersection of advanced technology, national security, and unexplained disappearances demands a thorough and transparent investigation.