Status epilepticus is a rare complication of conventional single-stimulus electroconvulsive therapy (ECT). We report a case of ECT-induced nonconvulsive generalized status epilepticus (NGS) that lasted 3.5 days. The patient showed regressed psychotic behavior coupled with waxing and waning mutism and unresponsiveness as well as subtle unilateral motor signs. The diagnosis of NGS requires electroencephalographic confirmation.