Sheriff's deputies responded to a report of a stabbing at a house party in the 1500 block of "K" Street in San Miguel Sunday night around 10:30 p.m.
Detectives were told the party was being held for 19-year-old Benjamin Dealba, Jr., who was leaving for the U.S. Air Force the following day.
Dealba said 21-year-old Jon Richard Dacy of Pollock Pines, Calif., showed up uninvited to the party and began arguing with Dealba's father outside the residence. The argument escalated and Dacy allegedly struck Dealba's father several times with his fists.
The younger Dealba then went to his room, retrieved a knife and confronted Dacy. Dealba says Dacy threw a punch and Dealba responded by stabbing him.
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Dacy suffered a cut and a puncture wound to his stomach and was transported to Sierra Vista Regional Medical Center.
Dealba was arrested and charged with assault with a deadly weapon.