The jury in the trial of former Bixby Energy Systems CEO Robert Walker completed its first day of deliberations without reaching a verdict.

Walker, 71, is on trial for 17 counts of fraud, conspiracy, tax evasion and witness tampering. Jury deliberations will resume Wednesday.

At his seven-week criminal trial in U.S. District Court in St. Paul, prosecutors contended he cheated 1,800 investors out of $57 million to enrich himself and others. Walker contends he committed no crime in the collapse of the Ramsey, Minn., company that initially sold corn-burning stoves, then promoted a coal-to-gas technology that never succeeded.

David Shaffer