Cassidy didn't show up for a status hearing Tuesday, but St. Lucie County Cliff Barnes says he expected the 60-year-old "Partridge Family" star to enter a plea without attending a court hearing. If Cassidy enters the written plea, he'll likely be sentenced Feb. 16.
Cassidy was arrested Nov. 3 after authorities said they spotted his car weaving on Florida's Turnpike near Fort Pierce.
The Highway Patrol's report says Cassidy failed a field sobriety test. Authorities say breath tests at the jail showed his blood-alcohol content at 0.139 and 0.141, above Florida's legal limit of 0.08.
Cassidy lives in Fort Lauderdale.