Actor and former member of the boy band New Kids on the Block. He has appeared in such films as Saw, The Sixth Sense, and Planet of the Apes. He also starred in the HBO miniseries Band of Brothers. In 2010, he began playing Danny Reagan on the CBS series Blue Bloods.
He made his acting debut in the 1996 film Bullet.
He won a Teen Choice Award for his work in the Saw films.
He has brothers named Mark, Robert and Paul. He married Kimberly Fey in 1999 but divorced in 2010. He married anti-vaccination advocate Jenny McCarthy on August 31, 2014. He has two sons named Xavier and Elijah.
He played a supporting role in the 1996 crime thriller Ransom, which stars Mel Gibson.