Pop singer best known as a member of the boy band 98 Degrees, known for songs such as "True to Your Heart." He later won Dancing with the Stars.
He was a combat medic in the United States Army and an EMT in New York City.
He was the co-host for the Miss USA Pageant in 2006.
He married Lea Lachey on October 14, 2000. He has a son named Hudson and a daughter named Isabella.
He is the brother of Nick Lachey, another member of 98 Degrees.