A Sag Harbor man pleaded guilty to vehicular assault and other crimes Tuesday, six months after being involved in a collision in East Hampton Town that seriously injured a 6-year-old boy and his mother, law enforcement authorities said.

William Hurley, 60, pleaded guilty to two counts of second-degree vehicular assault, second- and third-degree assault, two counts of driving while intoxicated and reckless driving, said Suffolk District Attorney Thomas Spota, in a news release issued after the plea before state Supreme Court Justice Fernando Camacho in Central Islip.

Camacho is expected to sentence Hurley to two years in prison and two years of post-release supervision, the release said. Hurley's attorney could not be reached for comment.

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Last July, Hurley crossed the center line in his Toyota pickup truck on Route 114 and collided with a BMW driven by Elizabeth Krimendahl, 53, of New York City, who suffered a leg injury, authorities said. Her son was hospitalized with a skull injury. Hurley, authorities said, had a blood alcohol level of .14 percent, nearly twice the legal limit for driving of .08.

"The defendant, who was driving all over the highway crossing over the double yellow line several times prior to the crash, told East Hampton Town police officers that he was tired, and admitted at the scene that he consumed two drinks made of vodka and grapefruit juice, drinks that he described as 'strong ones,' " Spota said.