MEXICO CITY (AP) -- Mexican junior welterweight Marco Antonio Nazareth has died at a hospital in Puerto Vallarta, four days after sustaining a brain hemorrhage in a loss to Omar Chavez.

The 23-year-old Nazareth was hospitalized after the fight, in which Nazareth was knocked down in the first round and knocked out in the fourth.

Nazareth underwent surgery after the fight, but his condition steadily worsened. His professional record was four victories -- three by knockout -- and four losses.

The undefeated Chavez is the son of former champion Julio Cesar Chavez.

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