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(CNN) -- After trying for the past month to identify a man who authorities say suffers from amnesia, police identified him Sunday as Jeff Ingram, 40, of Olympia, Washington.
The man, called "Al" by police and the news media, has been diagnosed with dissociative fugue, a rare form of amnesia, Det. Virginia Quinones of the Denver police told reporters.
The Merck Manual describes the disorder as involving one or more episode of amnesia that is sometimes accompanied by sudden travel. (Watch the plea that "Al's" family saw -- 1:21 )
Ingram, who has been in Denver since September 10, left Olympia on September 6 to visit relatives in Alberta, Canada, his fiancee told police.
"Nobody heard anything since," Quinones said. She said Ingram's family and fiancee, whom she identified only as Penny, filed a missing persons report in Washington.
Police said diagnosis of the condition hindered attempts to identify the man.
"He had to go through a variety of tests at the hospital, and he had to be under a doctor's care," Quinones said.
Once doctors determined that the unidentified man had a medical problem, "they contacted our agency, and we took it from there, as a missing person (case)," Quinones said.
During a news conference Friday, Ingram appealed to the public for help in regaining his identity.
"I feel totally lost; I feel totally alone," he told reporters. "I want my past. I want who I was, or who I am."
Quinones said Ingram's family saw the news conference and contacted Penny, who then contacted Denver police.
"Jeff has now been placed in care of doctor," Quinones said. "And he has a long way to go."
Ingram departed Olympia in a blue Neon with Canadian plates, which is missing, Quinones said.
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