Video of Michael Phelps Swerving in a Maryland Tunnel

One of the most-decorated athletes of all time pleads guilty to DUI charge, promises to do better on the road to recovery.
1:40 | 12/20/14

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Transcript for Video of Michael Phelps Swerving in a Maryland Tunnel
Next tonight here, America's biggest olympic star, more medals than anyone else, in court today. Tonight, the video that led to his arrest, and what he said. Here's gio Benitez. Reporter: Tonight, in newly-released video, for the first time, we're seeing Michael Phelps' land rover before his DUI arrest in September. Watch again, his SUV swerving inside a Maryland tunnel, narrowly missing a tractor-trailer. Allegedly going 84 miles per hour in a 45-mile-per-hour zone. Today, the 18-time olympic gold medalist admitting in court he was driving under the influence, pleading guilty. The 29-year-old registering a 0.14 blood alcohol level, nearly twice the legal limit. Today, put on probation for 18 months, a one-year prison term suspended. I'm happy to be moving forward and I'll continue to grow from this and continue on my path to recovery. Reporter: One of the most decorated athletes of all time, Michael Phelps is going to win gold! Reporter: This was not Phelps' first run-in with the law. In 2004, also arrested for drunk driving. And in 2009, usa swimming suspending him for three months after a tabloid published this photo of him apparently smoking marijua marijuana. Tonight, these new images, showing Phelps taking a breathalyzer that September night, and getting cuffed by officers. A long way from the olympics. He'd described the water there as his refuge from a childhood full of bullies and a diagnosis of add. Michael Phelps, again in the spotlight, now promising to do better. Gio Benitez, ABC news, New York. When we come back, new

This transcript has been automatically generated and may not be 100% accurate.

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