A man suspected by police of stabbing a longtime friend in the chest during an argument over a billiards shot in Southeast Austin faces a charge of aggravated assault with a deadly weapon.

According to an arrest warrant affidavit, Baldemar Gonzales Hernandez, 56, was shooting pool at his home in the 5300 block of Fence Row on Nov. 19 with his friend of 10 years, Joe Vargas, 51, when the two began arguing over a shot.

The document said Hernandez came close to Vargas during the argument and eventually pulled an unknown object out of his pocket and shoved Vargas.

"Vargas stated that after Hernandez shoved him, he felt a warm pain from his chest and then noticed that he was bleeding profusely," the affidavit said.

Vargas managed to drive himself home, where EMS crews met him to take him to an area hospital.

According to the document, the stab wound was so deep that it caused the victim's lung to hemorrhage.

"This puncture could have been fatal had it ruptured the pulmonary artery," the affidavit said.

Authorities at the Travis County Jail said Hernandez was not in custody as of Monday afternoon.