A 33-year-old Vienna man was shot to death and a man and woman were wounded early yesterday in a shooting incident in Annandale that Fairfax County police said apparently was set off by an argument over the woman.

Police said they found the body of Leon Francis Moore, 33, of 210 Talahi Rd., Vienna, who had been shot in the head, lying in the front yard of a white frame house at 4104 Hummer Rd. when they arrived at the scene shortly after 6 a.m. Lying wounded in front of the house was Leslie McCain, 22, who police said lives there.

Police summoned to a nearby 7-Eleven store off Little River Turnpike had already found Raymond Thomas Ball, 33, of Haymarket, Va., who was also wounded, police said.

McCain was reported in serious but stable condition last night at Fairfax Hospital. Ball, charged with maliciously wounding McCain and breaking and entering with intent to commit assault, was reported in stable condition at the same hospital.

Police said Ball, a former boyfriend of McCain, went to visit her early yesterday and was talking to her inside the house when Moore, who was also in the house, approached with a .25-caliber handgun.

A scuffle ensued during which "Moore apparently shot Ball in the chest"; Moore was fatally wounded, and McCain shot in the neck with the same handgun, according to Fairfax police spokesman Warren Carmichael. No charges have been placed in connection with Moore's death.

All three persons then apparently stumbled out of the house. Ball, holding the gun, staggered to the 7-Eleven store to which police were summoned by a clerk, police said.

Ball met McCain when she visited him in 1978 at a Morgantown, W. Va., prison where he was serving a sentence for federal drug offenses, according to court documents that include a letter Ball sent to a Fairfax County judge in November 1980.

"Leslie was using drugs . . . she was attracted to me for negative reasons to begin with," Ball wrote in the letter.

In the spring of 1979, after Ball had been released from prison, both Ball and McCain were arrested and charged with distribution of phencyclidine (PCP) after selling the drug to undercover detectives.

Ball was sentenced to serve 10 years. He was released from prison last summer, according to Fairfax County Commonwealth's Attorney Robert F. Horan Jr. McCain was given a five-year sentence, with four years and nine months suspended. She was ordered to serve more of the sentence later for violating requirements of a drug-treatment program and was released from prison in March 1981, Horan said.

During that term in prison, Ball wrote Fairfax Circuit Judge Thomas J. Middleton and told him he still loved McCain and wanted to marry her. Police said it was unclear when the two broke off their relationship.

Horan said Moore had been convicted of arson and minor drug possession charges in Fairfax County in the mid-1970s.

The small house that McCain rented on Hummer Road is sandwiched between the new Little River Towns housing development and the sprawling Annandale Community Park. McCain had been scheduled to move out of the house this weekend, according to Horan.