Brennan, circa 1990
- Missing Since 05/15/1990
- Missing From Glenwood Springs, Colorado
- Classification Endangered Missing
- Date of Birth 05/30/1950 (69)
- Age 39 years old
- Height and Weight 5'11, 220 pounds
- Clothing/Jewelry Description A raincoat. Carrying a small duffel bag.
- Medical Conditions Brennan may have been suicidal at the time of his disappearance.
- Distinguishing Characteristics Caucasian male. Brown hair, blue eyes. Brennan's nickname is Billy. He has a purple scar near his left eyebrow, and he had a mustache at the time of his disappearance.