A former Houston doctor serving a decade in federal prison for bilking millions from insurance companies was sentenced Thursday to an additional year after admitting he asked a fellow inmate to arrange to have a federal prosecutor run over by an 18-wheeler to “make him like a pancake,” prosecutors said.

Ira Klein, a former Houston gastroenterologist, pleaded guilty to retaliating against Assistant U.S. Attorney Samuel Louis, who prosecuted the health fraud case. Klein was charged with orchestrating a murder-for-hire plot against his sixth wife, Gabrielle Puccini, and scheming to harm Louis and an FBI agent.