The chief executive of an Iowa-based brokerage firm admitted in a tell-all suicide note that he carried out an elaborate fraud scheme in which he embezzled at least $100 million from customers over two decades, federal investigators said Friday.

FBI agents arrested Peregrine Financial Group Inc. Russell Wasendorf Sr. at a local hospital Friday and he appeared in federal court later in the day on charges of lying to federal regulators. Court documents detail a wide-ranging fraud scheme in which Wasendorf apparently fooled colleagues, customers and regulators by creating fraudulent financial records.

Those documents detailed a note found in Wasendorf's car Monday, when authorities found him unresponsive in the vehicle outside the company's headquarters in Cedar Falls. "Through a scheme of using false bank statements I have been able to embezzle millions of dollars from customer accounts," Wasendorf wrote, adding that the fraud had gone undetected "until now."

Assistant U.S. Attorney Peter Deegan said during the court hearing Friday that Wasendorf could face a wide range of additional criminal charges and decades in prison for what the prosecutor called a $200 million scheme in which Wasendorf embezzled customer funds for 20 years.

Wasendorf, who investigators said tried to commit suicide by hooking up a tube to his car's tailpipe, had been hospitalized since Monday. Deegan and the FBI declined comment on his arrest, but Chicago-based lawyer Thomas Breen said FBI agents "removed him from his hospital bed" at University of Iowa Hospitals and Clinics in Iowa City. Breen said he was on the phone with Wasendorf at the time.