Frederich H. Cassel was 50 when he died on December 11, 1972, after a brief hospitalization for shortness of breath and chest congestion. Initial complaints began November 3; he was hospitalized November 9, released November 30, then readmitted December 8 and died three days later. An autopsy and toxicology revealed he had been poisoned, and his death is classified as a homicide by the Jefferson County Sheriff’s Office.

Cassel worked for the General Services Administration at the Federal Center in Lakewood and held top-secret security clearance; his work history included assignments in San Francisco and Washington, D.C. In the months before his death he kept a diary documenting unusual occurrences and recorded suspicions about his wife and other men. No arrests have been announced and no suspects have been publicly named.

Does anyone have information about Cassel, his diary, or contacts from his time at the Federal Center who might help explain what happened?