On Wednesday, they released a recording of a 1987 emergency call in hopes of tracking down the man dubbed the "Grim Sleeper," who has killed at least 11 times in nearly a quarter century.
"It's a long shot, that's for sure," said Detective Dennis Kilcoyne. "I am hoping a couple people call us. ... Maybe that will lead us to something."
Kilcoyne heads a squad of seven Los Angeles homicide detectives who for nearly two years have been assigned exclusively to the case. The killer most recently struck Jan. 1, 2007, and his first known victim was in 1985.
Police have pored over investigative files from all the killings and are now focusing on the January 1987 slaying of Barbara Ware, a 23-year-old with a history of prostitution who was found shot to death in a South Los Angeles alley.
A man saw a blue-and-white van dump her body. He called police with his account and gave the license plate number of the van. Within about an hour, police had tracked the van to its registered address at a church.
"The engine was still warm to the touch," Kilcoyne said.
Several congregants were inside the now-defunct Cosmopolitan Cathedral but no one seemed to know anything.
"Then the trail stops there," said Kilcoyne. "It sounds like it was a pretty good road map for the investigation at the time and it just fizzled out."
Kilcoyne and his men hope to track down former churchgoers or even someone who knows the voice on the emergency call.
On the two-minute call, a man described to a dispatcher how he'd seen someone drop the body off from the van, then throw a gas tank on top of her. He said he didn't see the man driving the van.
"I'd like to report a murder - a dead body or something," the caller said. "He threw her out ... the only thing you can see out is her feet."
When asked for his name, the caller declined.
"I know too many people," he said, then hung up.
Kilcoyne is accustomed to promising leads turning cold.
Six victims were found with the killer's DNA on them but a search of prisoner databases came up blank. Detectives went on to ask the California Department of Justice to run a DNA search that sought possible matches to the killer's relatives. It was the first time the controversial search was carried out in the U.S., Kilcoyne said.
"It didn't produce an answer," Kilcoyne said. "Nothing."
The suspect kills by gunshot or strangulation, in some cases both, usually after some kind of sexual contact. Ten victims were women, all were black and several were prostitutes. The bodies were all found outside, usually in dirty alleyways a few miles south of downtown.
The $500,000 award offer is thought to be the biggest ever in the city. Billboards announcing the offer loom over streets near where the victims were found.
"We still have no idea who this guy is," Kilcoyne said. "We've got a half-million-dollar reward out there on billboards and no one calls."
The killings were featured on "America's Most Wanted" and dozens of tipsters called detectives after the case was first made public last year, but leads went nowhere.
The first round of killings happened at a time parts of the city were suffering from extreme violence and many young women fell prey to newfound addictions of crack cocaine and other drugs.
Police Chief William Bratton assembled Kilcoyne's squad in June 2007 after the death of the killer's most recent known victim, 25-year-old Janecia Peters, who was found shot to death in a trash bin in a graffiti-tagged alley.
"We realized we've got a serious problem," Kilcoyne said. "This guy is still out there."
Because of the race of his victims, critics faulted the Police Department for not investigating the killings sooner and said the city was disinterested in the case.
Porter Alexander, 68, whose youngest daughter, Monique Alexander, was killed in 1988, said police initially seemed reluctant to investigate her death because there were signs she may have been involved in prostitution.
"They didn't show any strong concern," he said. "If I didn't call, I didn't get a call."
Police don't know why the killer took a 14-year hiatus. The gap led the LA Weekly newspaper, which first wrote about him, to dub him the "Grim Sleeper."
One description of the suspect exists - from a woman who survived an attack in 1988. She recalled him driving an orange Pinto and offering her a ride to her sister's house.
After exchanging some lighthearted banter, she agreed to the driver's offer. He had chiseled features, a low afro and wore a black polo shirt. He would now be in his late 40s to early 60s.
Shortly after she got in the car, she said, he shot her. "I woke up in the dark, I was in the middle of the street," said the woman, whose number was provided by police. She asked not to be named because she is the victim of a crime.
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