Seven months after her untimely death, sordid details of Brittany Murphy's troubled life and marriage continue to emerge. Her former business manager, Los Angeles-based accountant Jeffrey Morgenroth, tells PEOPLE that her husband Simon Monjack was squandering the late movie star's fortune just before his own sudden death in May from pneumonia and anemia, which also killed Murphy.

"There were huge amounts of money in [Brittany's] pension plan and bank account, and all of that's gone," Morgenroth tells the magazine. "I would see it on the statements. There was money being withdrawn by Simon, hundreds of thousands."