Walnut Creek, California, is an affluent suburb of San Francisco. On the morning of July 11 th , 1988, a shopping center groundskeeper noticed a Corvette sitting alone in the parking lot. A man seemed to be napping behind the wheel. But the man wasn't asleep, he was dead.

The victim was identified as Lester Garnier, an undercover vice officer with the San Francisco Police Department, who lived in nearby Concord. Detective Jerry Whiting of the Walnut Creek Police Department:

"The cause of death was determined to be two bullet wounds. This was an extremely cold-blooded, deliberate killing. The sort of person that would do something like this is extremely dangerous. There was very little evidence left at the crime scene that would give us much help in identifying the criminal. We've been unable to find any motive at all for the killing of Les Garnier."

If he was off duty, Lester was usually behind the wheel of his prized 1984 Corvette. He enjoyed the good life, but was also devoted to his parents. Jean Garnier is Lester's mother:

"Lester was a wonderful son. He always was there for us. He gave us security, knowing that if anything happens, he's always there for us."

Those who knew him said Lester had a reputation as a ladies man. His natural charm with women also came in handy on the job. His beat was San Francisco's Mission District, the neighborhood he was born and raised in and an area with its share of streetwalkers. According to Detective George R. Willis of the Walnut Creek Police Department, Lester often duped prostitutes by posing as a customer:

"We found that he had made numerous arrests for prostitution. We certainly examined that aspect of his life and we weren't able to find any connection with our case. We interviewed several of the prostitutes that Lester had arrested and found that many of them spoke highly of him, even though he had arrested them."

Before his murder, one of Lester's final assignments was to stake out a San Francisco brothel said to be patronized by civic leaders and police officers. After it was raided, Roger Boas, a local mayoral candidate, pleaded guilty to charges of having sex there with underage prostitutes. Several police officers were also investigated, but only one was charged and later fired. Rumors circulated that corrupt members of the police force had Lester murdered in retaliation for his work in busting the ring. According to Det. Whiting, that theory was investigated:

"We did address those issues, but we found no connection at all between Mr. Garnier's death and the Roger Boas case, or any other case, for that matter."

On the evening of his death, Lester left his home to meet a friend for a movie in San Francisco. Less than 20 minutes later, according to Det. Whiting, he called from his car with a message:

"During this conversation, he cancelled a meeting with his friend saying it was getting late. After that, we don't know what happened to him until his vehicle showed up in the parking lot shortly before 11:30 P.M.. That time period is very critical."

Det. George Willis:

"As a portion of our investigation, naturally, we searched for witnesses and we discovered that there was a carpet layer working in one of the stores late that evening. As he went out to his truck, he heard what sounded to him like firecrackers. It was around the Fourth of July, so he discounted those sounds as firecrackers. Shortly after, he looked up and saw two women walking across the parking lot. The women entered two different vehicles and left."

The witness described one of the women as being in her late 20s, about 5'6" and said she weighed about 110 pounds. The other was described as being in her mid 30s, tall, with a slender build. Det. Whiting:

"We also located one witness who was actually driving through the lot. As he drove past the Corvette, he saw a woman open the passenger door and exit the vehicle. He saw her walk around the vehicle and appear to look in the driver's side of the Corvette. It's possible that these were just two separate sightings, not associated with each other. However, it's also possible that they are somehow related."

Under hypnosis, the second witness helped police create a composite drawing of the blond-haired woman. Her appearance was similar to the other eyewitness description.

Det. Whiting showed the composite to the carpet layer:

"He felt that this sketch closely resembled the shorter of the two women that he saw walking across the parking lot."

There is one other clue suggesting this woman might be involved in the murder. Police used a fingerprint found in Lester's car to identify the blonde-haired woman seen by the witness. She is a Scottish national who's lived in the United States since 1985. Although she's been named as a suspect, authorities don't have enough evidence to file charges.

The mayor's office in San Francisco is offering $250,000 reward for information leading to an arrest in this case.

Composite of a woman seen in the parking lot

Gender: Female DOB: Approx 1961 Height: 5'6" Weight: 110 lbs. Hair: Blonde