Overview
- He died in the federal prison in Cumberland, Maryland, where he was serving a life sentence for espionage.
- Facing heavy debts and alcoholism, he began spying in 1985 by selling the identities of KGB officials secretly aiding the United States for $50,000.
- A federal investigation intensified after agents noticed his lavish spending, leading to his arrest on February 21, 1994.
- Intelligence assessments credit his betrayal with compromising more than 100 CIA operations and causing the deaths of at least ten clandestine collaborators.
- He cooperated after his arrest and received life in prison, while his wife, Maria del Rosario Casas Dupuy, was sentenced to five years.