"We've received hundreds, literally hundreds and hundreds, of calls from all over the United States as well as numerous calls from western Europe," Thomas said. "We've gotten a number of calls from families who are still despondent. Your heart really goes out to them."
Orange County District Attorney Tony Rackauckas said they already have six potential new cases they could pin on Alcala, who has been labeled the "Dating Game" killer because of his appearance on the 1970s game show.
At the time of his appearance, where he was bachelor No. 1, he had already been convicted in the rape and brutal beating of an 8-year-old girl.
Alcala was convicted Feb. 25 in the 1979 rape and murder of 12-year-old Huntington Beach ballet student Robin Samsoe, and the strangulation of four other women between 1970 and 1979.
The photos were found in 1979, in a Seattle storage locker that had been rented by Alcala, but not released until recently because of legal concerns.
Phone calls came flooding into authorities almost immediately.
"The calls are basically along two lines," Huntington Beach Police Detective Patrick Ellis told ABC's Seattle affiliate KOMO. "No. 1: 'Yes, that's my photograph. I am alive and well,' and giving us details of Mr. Alcala way back when, 30 years ago.
"Or, the calls saying, 'Hey, my sister, mother ... was reported missing back then, and I think her photograph is on the Web site,' and they're providing us with information as far as the person's name, where they were last seen alive," he said. "Some people aren't positive, but they're pretty sure.
"Until we talk to the victims' families, get other photographs for comparison purposes and more details on where their bodies were recovered -- if they were recovered at all -- we can't really say at this point," Ellis said. "We just don't know."
Rackauckas said each possible match to one of the photos is investigated first by looking at the whereabouts of the victims at the time and that of Alcala. In some cases, he said, DNA evidence is available for further confirmation.
Alcala, who had a fine arts degree from UCLA, took the photos before his first arrest in 1979.
Some show remote settings similar to the region where Samsoe's body was found. A few of the photos are of men.
Police say Alcala thought of himself as a skilled photographer and may have used the camera to lure his victims.
Alcala had traveled across the country several times when he was studying film at New York University in the 1970s, even working briefly with director Roman Polanski.
Steve Hodel, a retired detective with the Los Angeles Police Department, told ABC's Nightline that Alcala could have killed many more victims between the East and West Coasts.
But since his conviction, Alcala has more often been likened to the notorious serial killer Ted Bundy.
During the trial in the Orange County Criminal Courthouse in Santa Ana, Calif., four witnesses recalled Alcala trying to get them to pose for him in their bikinis on the beach the day Samsoe disappeared.
The young girl was kidnapped while riding her bicycle to ballet class in Huntington Beach. Her body was found 12 days later in the Angeles National Forest, where it had been mutilated by wild animals.
Prosecutors said that Alcala's method of killing was to choke his victims with his bare hands until they were unconscious and then to allow them to regain consciousness.
"He gets off on the infliction of pain on other people," said prosecutor Matt Murphy at Alcala's trial.
If you know who these women are, contact Huntington Beach Police Detective Patrick Ellis, at 714-375-5066, or e-mail him at email@example.com.