Shepard, 65, who police said had a blood alcohol level of .175 when he was arrested last month, reportedly told a judge Wednesday, "I never intend to drive under the influence again ... It's not worth it."
Police said they pulled Shepard over for driving 46 mph in a residential area and suspected he was intoxicated.
The longtime beau of actress Jessica Lange wrote the plays "Buried Child," "True West" and "Kicking a Dead Horse," and has appeared in the films "Don't Come Knocking," "The Notebook," "Swordfish" and "The Right Stuff."
TMZ said Shepard was fined $600 plus court costs, placed on 24 months court supervision and ordered to complete an alcohol treatment course and 100 hours of community service as part of his plea deal.
Notable deaths of 2014 [PHOTOS]