Authorities searching for missing retired Air Force Maj. Gen. William "Neil" McCasland are investigating a new development after hiking boots believed to belong to the missing general were discovered at his vacation home, officials said Monday.

Investigators said they are still working to determine whether the boots are connected to McCasland’s disappearance, which has now stretched into a third week.

During a Monday news conference, the Bernalillo County Sheriff’s Office said there have still been no confirmed sightings of the 68-year-old aerospace engineer, and the Silver Alert issued for him remains in effect.

McCasland was last seen leaving his Albuquerque, New Mexico, home on foot around 11 a.m. on Feb. 27, authorities said.

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Investigators noted he left behind his phone, glasses and wearable devices at the house. However, several personal items remain missing, including his wallet, a revolver and a holster for the gun. Investigators also said Monday that a red backpack is unaccounted for.

Earlier that morning, McCasland was seen speaking with a repairman at his home around 9 to 10 a.m., according to authorities.

The repairman described McCasland as being in a "mental fog," but investigators said there was no indication he was disoriented or confused, describing him instead as a "highly intelligent, highly capable" person.

"Out of an abundance of caution, we escalated the search to a Silver Alert with that information that was given to us early on," a Bernalillo County Sheriff’s Office official said.

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Authorities say McCasland vanished within roughly a one-hour window while his wife was out of the house for an appointment.

Search teams have also recovered a U.S. Air Force sweatshirt more than a mile from McCasland’s home, though investigators have not confirmed whether the item belonged to him.

McCasland is described as 5 feet, 11 inches tall with white hair and blue eyes and was last seen wearing a light green, button-up outdoor shirt with two chest pockets.

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Officials believe he left his home on foot.

The retired general is known to be an avid outdoorsman who frequently hikes, runs and cycles in Albuquerque’s Northeast Heights and the nearby Sandia Foothills, where search crews have focused some of their efforts.

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Authorities said they have received dozens of tips and are urging residents to check home security video captured between Feb. 27 and Feb. 28, which investigators say is a critical window in the search.

The FBI joined the search effort on March 3, assisting local authorities as the investigation continues.

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Investigators said they had not uncovered evidence of foul play, though officials have emphasized that no scenarios have been ruled out.

McCasland’s wife, Susan McCasland Wilkerson, has also pushed back on speculation tying his disappearance to his past military work.

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"It is true that when Neil was in the Air Force, he had access to some highly classified programs and information," she wrote in a Facebook post. "He retired from the AF almost 13 years ago and has had only very commonly held clearances since."

Before retiring in 2013, McCasland commanded the Air Force Research Laboratory at Wright-Patterson Air Force Base in Ohio and holds a Ph.D. in aerospace engineering from the Massachusetts Institute of Technology.

Despite online speculation, his wife said he had no special knowledge about extraterrestrials or the Roswell incident.

Authorities are asking anyone with information about McCasland’s whereabouts to text BCSO to 847411 or contact the sheriff’s Missing Persons Unit at 505-468-7070.

Kristin Cabot is pushing back against the narrative behind the viral "Coldplay Kiss Cam" moment that derailed her career.

The former Astronomer HR executive claimed that her relationship with then-CEO Andy Byron was a byproduct of a high-intensity professional culture where sharing desks and social drinks were standard practice during an upcoming appearance on "The Oprah Podcast."

Despite the global speculation about an illicit affair, Cabot maintained that she was already separated from her husband at the time and that he was aware of her "very close" working relationship with Byron. Cabot explained that her daughter alerted her to the fact that her estranged husband was attending the same Coldplay concert she was at with Byron on that fateful night.

"My daughter's like, ‘This is so fun! Great!’ … and in my mind I thought, 'Well, that's... is this going to be weird if he sees me with Andy? Like, if I run into him,'" she told Oprah.

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Cabot's momentary worry didn't linger for long.

"But then I was like, I'm at Gillette Stadium, there's 55,000 people here. I'm probably not going to run into him. But it doesn't matter – I mean, it would have been better at the end of the day if I had just run into him," she explained. "But, you know, he knows – he knows how closely Andy and I work together. He knows we socially got lunches and got drinks. It was fine."

"He knows the nature of my work and the way the relationships – I've shared desks with the CEOs I've worked with," Cabot emphasized. "Like, it's just a very close [relationship], and so it didn't matter."

During Coldplay's performance on July 16, Byron appeared on the Kiss Cam with his arms wrapped around a woman, who was later identified as Cabot. The two were shown during Martin's "The Jumbotron Song," where the singer improvises lyrics about the couples shown to the crowd.

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Cabot immediately covered her face and turned away from the camera, while a stunned Byron ducked down and exited the frame. Martin then joked that, "Either they’re having an affair or they’re just very shy."

The moment ignited speculation of infidelity across social media as video of the exchange went viral. At the time, she was separated from her husband and Byron had claimed he was also separated. Cabot has since filed for divorce.

"Astronomer is committed to the values and culture that have guided us since our founding. Our leaders are expected to set the standard in both conduct and accountability," the company shared in a statement days later. "The Board of Directors has initiated a formal investigation into this matter, and we will have additional details to share very shortly."

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On July 20, Astronomer informed its social media followers that Byron had resigned from the company. Cabot later resigned from her role as chief people officer at Astronomer, a week after the video of her cuddling up with Byron went viral.

The viral moment led to online chatter and even Gwyneth Paltrow, Chris Martin's ex-wife, poked fun at the Kiss Cam controversy by teaming up with Astronomer as their "temporary spokesperson."