He had left his home September 6, 2006 to visit his mother in Slave Lake, Alberta, but never made a scheduled stop that evening at his fiancee’s mother’s house in Bellingham, Wash., according to the Thurston County, Wash., sheriff’s office.

Ingram said he found himself in Denver on September 10, and walked around for six hours asking people for help. He ended up at a hospital where police spokeswoman Virginia Quinones said Ingram was diagnosed with dissociative fugue, a type of amnesia.

During that weekend, Ingram appeared on several news shows pleading: “If anybody recognizes me, knows who I am, please let somebody know”,- he pleaded.

Ingram’s fiancee, Penny Hansen of Olympia, a state transportation and policy analyst, told KCNC-TV in Denver that his family and friends were relieved to learn he was alive and in good condition.

Ingram’s car has not been found, and authorities do not know how he got to Denver, according to Thurston County sheriff’s Capt. Jim Chamberlain.

Ingram had experienced an episode of amnesia before in 1995 when he disappeared during a trip to a grocery store. Nine months later, he was found in a Seattle hospital.

His family members stated that he was going through a really stressful time before he left.

It is known that stress and anxiety could trigger dissociative conditions including fugue which traveling without memory of the previous identity.

People with dissociative fugue typically do not have major psychiatric or medical problems.

The recent research indicates, however that there are some soft neurological underlying issues that make these people to be prone to dissociative conditions under severe stress with a temporarily loss of their sense of identity, produce confusion and trigger impulsive wander away from home.

Ref: http://www.clevelandclinic.org/health/health-info/