Cardinals manager Tony La Russa pleaded guilty to driving under the influence Wednesday, eight months after police found him asleep inside his running sport utility vehicle at a stop light and smelling of alcohol. "I accept full responsibility for my conduct, and assure everyone that I have learned a very valuable lesson and that this will never occur again," La Russa said in a statement released by his attorney, David Roth. La Russa did not appear in court to plead guilty. As part of his plea agreement, La Russa will serve at least six months' probation, pay a $678.50 fine, complete DUI school and any recommended treatment and complete 50 hours of community service, according to state prosecutors.