In the dorm, Army investigators found $87 in cash, two unmailed letters and Cox's wristwatch. He disappeared wearing his dress grays, in full overcoat.
Soon the FBI joined the search, and Dick Cox became, for a time, famous. Life and Coronet magazines wrote about the mystery.
No one heard from Dick Cox again - not his fiancee, his mother, his brother or sisters, his best friends, no one. To this day, he is the only cadet ever to have vanished from West Point without a trace.
On that Saturday night in 1950, Marshall Jacobs was a student at Duquesne University in Pittsburgh. As a child he had lived in New York near the West Point campus and loved its atmosphere and historic lore. Jacobs read about Dick Cox in the New York Times and followed the story for years, until the press forgot about it.
Later Jacobs moved to Florida, where he taught high school history until his retirement in 1986. Then he finally had time to chase the ghost of Dick Cox.
"Cadets," Jacobs would say to his wife, Lois, "just don't disappear from West Point."
He traveled widely, interviewing Cox's friends, family and classmates, and amassing four drawers of documents. Using the Freedom of Information Act, Jacobs got more than 1,500 pages of FBI files, and more from the Army's
Criminal Investigations Division (CID).
He was impressed by what he saw. "They really tried to find this kid," Jacobs says. He wasn't sure he could do any better; his wife encouraged him to press on. For a retiree it was an unusually consuming hobby, but this was an unusual case.
Among the provocative theories Jacobs encountered: Dick Cox had secretly joined the CIA. Another: Cox had been involved in the death of a pregnant woman while he had been stationed in West Germany.
Still another: Cox had been a key witness in a court-martial case, and fled the Army because he feared for his life. One theory even linked Cox to the cheating scandal that rocked West Point a year after he disappeared.
Perhaps the wildest story of all had Cox kidnapped, put aboard a Polish freighter and eventually transported to a Siberian prison as punishment for espionage against the Soviets during his German tour.
Methodically Jacobs checked this lead, as he did the rest. In fact, during the 1950s there was a young American named Cox in the Soviet Union's Vorkuta prison - but it was not Richard.
Government files, as well as Jacobs' own interviews, suggest that Dick Cox might have staged his own disappearance. There is testimony, Jacobs says, of homosexual relationships with other cadets - a secret that would have jeopardized Cox's Army career.
Apparently, he had also become disenchanted with West Point. One of the letters found in his room was written to his fiancee. In it, Cox wrote bitterly of the academy, and even drew a picture of a soldier spitting on the letterhead.
"The thought keeps entering my mind," he wrote, "and I've yet to discover exactly what I'll have lost by leaving the dear old corps."
Following this avenue, Marshall Jacobs got a break. In 1986 a San Francisco detective investigating a high-seas murder received an old newspaper clipping in the mail. The anonymous sender hinted that the detective's murder suspect had also been involved in the case of the missing cadet.
The detective had never heard of Dick Cox, but he gave the tip to the CID. When Jacobs heard about it, he flew west.
A MURDER SUSPECT
The murder suspect's name was Robert W. Frisbee, a secretary who during a Canadian cruise had allegedly murdered the wealthy widow for whom he worked.
Checking back, Jacobs learned that Frisbee, then known as Robert Dion, had once been stationed at Fort Knox, Ky., with Dick Cox. The two men knew each other and, Jacobs says, might have had a relationship.
More significantly, a Canadian prosecutor told Jacobs that Dion/Frisbee had once been involved in a phony-ID racket in the New York area. In appearance, Dion matched the "George" who visited Dick Cox at West Point a week before he vanished, and was to meet him again for dinner that night of Jan. 14.
Of all the possibilities, Marshall Jacobs believes this is the most likely: That Cadet Cox - under pressure to marry from his fiancee, ambivalent about his sexuality, disillusioned with the academy - obtained a bogus identity from Dion and simply became someone else.
Jacobs thinks there's a good chance that Cox is alive today, using another name. That over these 38 years he never once contacted his family - even as his mother lay dying two years ago - is hard to believe. But it is possible. ''Very few people, even his own family, knew the real Dick Cox," says Jacobs.
The full story might never be known. Robert Dion Frisbee, now appealing a life sentence, has not replied to Jacobs' request for an interview. Maybe someday, his attorney says, but not now.
Meanwhile, West Point has asked Marshall Jacobs to donate his voluminous research about Richard Cox to its library. "That's quite an honor," the retired schoolteacher says.
A few months ago he was back at West Point, meeting with CID agents about the case. Walking the campus, Jacobs met a fourth-year cadet who asked him if the legend was true - was there really a Dick Cox? Did he really vanish in his
"Take it from me," Marshall Jacobs told the young man, "it's true."
Jacobs plans to write a book about the lost cadet. Oblivion, he would call it.
In the annual Registry of Cadets, these words are still written next to the name of Richard Colvin Cox: "Mysteriously disappeared, 14 Jan 50, Cadet A- 21."