Video released publicly Friday shows the husband of former U.S. House Speaker Nancy Pelosi fighting with his assailant for control of a hammer moments before he was struck during a brutal attack in the couple's San Francisco home last year.

The body-camera footage shows suspect David DePape wrest the tool from Paul Pelosi, 82, and lunge toward him with the hammer over his head. The blow to Pelosi occurs out of the camera's view and the officers — one of them cursing — rush into the house and jump on DePape.

Pelosi, apparently unconscious, can be seen lying face down on the floor in his pajama...