Colby Landrum was a passenger in Betty Cash's car during the Cash Landrum incident. According to accounts, the seven year old was terrified by the sight of a large, brightly lit diamond shaped object hovering at treetop level and emitting intense heat. His grandmother Vickie Landrum reported that Colby described the object as looking "like a big diamond," a description that later became central to the case's documentation.

Following the encounter, Colby reportedly experienced health symptoms similar to those reported by the adult witnesses, including nausea and skin irritation. His young age at the time of the event made his testimony a subject of particular interest to investigators studying witness reliability and the effects of traumatic experiences on memory.

At the time of the incident, Colby Landrum was a second grader living with his grandmother in Dayton, Texas. He had no prior involvement with UFO claims or publicity. His testimony was recorded during official investigations, including the August 1981 interview at Bergstrom Air Force Base.

As a child witness, investigators noted the consistency of his account with those of the adult witnesses, while also considering factors of childhood perception and memory.

Colby Landrum's testimony as a child witness presents unique considerations for UAP research. Investigators have noted that children may provide less filtered descriptions of anomalous events, though their accounts are also subject to influences from adult witnesses and media exposure.

Some skeptical analyses have questioned the degree to which a seven year old's perception and memory can be reliably assessed years after an event. Proponents argue that the consistency between Colby's description and those of the adult witnesses, recorded soon after the incident, lends credibility to the core details of the case.

The Cash Landrum case remains one of the few UAP incidents involving child witnesses, making Colby Landrum's testimony a subject of continued interest in studies of witness psychology and anomalous experience reporting.

Colby Landrum's testimony has been referenced in numerous books, documentaries, and research papers on the Cash Landrum case. His account as a child witness adds a distinctive dimension to the case's evidentiary record.

As an adult, Landrum has maintained a private life, with limited public commentary on the incident. His childhood experience continues to be studied in the context of witness reliability and the documentation of anomalous events.