SAN JOSE (AP) -- Pat Tillman's mother has published a new book about her family's struggles to get truthful information from the military on the former N-F-L star's death by friendly fire in Afghanistan.

Mary Tillman's book is called "Boots on the Ground by Dusk." In it she charts her family's efforts to cut through misleading official accounts of how Pat Tillman died as a U.S. Army Ranger in Afghanistan.

The Army told the Tillman family and the public Tillman was killed in an enemy ambush April 22, 2004. It waited about five weeks after it suspected friendly fire was involved before disclosing Tillman's own Ranger comrades shot him in what investigators concluded was a series of terrible mistakes.

"Boots on the Ground by Dusk" is based on Mrs. Tillman's review of thousands of pages of investigative documents stemming from Pat Tillman's death.

Citing documents and eyewitness accounts, Mrs. Tillman says she strongly suspects the men who shot her son stepped out of a Humvee to take aim carefully at him. They were not, as official accounts have asserted, speeding by on a bumpy mountain road. The shooters denied this.