(CNN) -- Dozens of tips poured into California authorities after they released more than 100 photos of women and children on Thursday that are believed to have been taken by a serial killer who appeared on the "Dating Game."

Police determined Friday that two female minors in the pictures, taken in the 1970s, are alive and well and have received tips on a handful of other women who could be dead or missing, according to Patrick Ellis, a detective with the Huntington Beach Police Department.

"We've received several calls saying that someone in a photo could be so-and-so who's been missing or found dead," Ellis said Friday. "The response has been overwhelming, and that's what we were looking for."

Investigators are trying to determine whether any of the people shown in the photos were victims of Rodney Alcala, 66, who was convicted last month of kidnapping and murdering a 12-year-old girl and raping and murdering four Los Angeles County women in the 1970s. A jury this week recommended he be sentenced to death.

Ellis said police received tips on as many as four dead or missing women who were identified by people calling and e-mailing about the photos. "People are saying that they recognize someone from their past, from school or college or the neighborhood beach," he said.

The two women who identified themselves from the photos on Friday were minors at the time the pictures were taken and are now in their 40s, Ellis said. Police are not releasing their identities, though Ellis said they live in California.

Huntington Beach Police are contacting law enforcement authorities across the country with information about dead or missing women who were identified by people calling or e-mailing on Friday, Ellis said. He stressed that police have not confirmed that any of the women or children in the photos are dead or missing.

The photographs were discovered in a storage unit Alcala kept in Seattle, Washington, said Susan Kang Schroeder, public affairs counsel for the Orange County district attorney. The locker also contained earrings that belonged to Robin Samsoe, the 12-year-old girl whom Alcala abducted and killed in 1979.

"One of the seminal pieces of evidence in the [Samsoe] case was an earring that Robin was wearing," Schroeder said. "And we know it was her earring because her mom had clipped part of the earring."

Schroeder said that the fact that the earrings were found in the same locker unit with the pictures raised fears that he may have considered the photographs trophies of his victims. "We know that Mr. Alcala used his photography as a ruse to get close to his victims," she said.

Alcala may be responsible for more than the five killings he has been convicted of committing, authorities said. "It's very possible," Schroeder told CNN. "Mr. Alcala is a predatory monster and we believe that he destroyed many lives everywhere he went."

According to the Orange County District Attorney, Alcala was convicted in 1972 of having kidnapped and molested a child in Los Angeles County in 1968. After serving a 34-month sentence, he was released.

In November 1977, Alcala raped, sodomized and murdered Jill Barcomb, an 18-year-old New Yorker who had recently moved to California, the district attorney said. "The defendant used a large rock to smash in the victim's face, causing blunt-force trauma, and strangled her to death by tying her belt and pant leg around her neck. He then left the victim's body in a mountainous area in the foothills near Hollywood."

The body was discovered soon after, and biological evidence was collected, but DNA technology was not yet available to find her killer.

The following month, Alcala raped, sodomized and murdered 27-year-old nurse Georgia Wixted, according to the district attorney. "The defendant used the claw end of a hammer to beat the victim and smash in her head. He strangled her to death using a nylon stocking and left her body in her Malibu apartment," according to the district attorney's Web site.

As with the Barcomb case, the body was discovered and biological evidence was collected, but no link was made to Alcala.

In 1978, Alcala appeared as a "Bachelor Number One" on "The Dating Game."

Jed Mills, who played "Bachelor Number 2," told CNN he had an almost immediate aversion to Alcala. "Something about him, I could not be near him," Mills recalled. "I am kind of bending toward the other guy to get away from him, and I don't know if I did that consciously. But thinking back on that, I probably did."

But Alcala succeeded in charming Bachelorette Cheryl Bradshaw from the other side of the "Dating Game" wall.

"Who will it be?" the host asked her at the end of the show.

"I'll take One [Bachelor Number One]," Bradshaw said, and out strolled Alcala.

While Alcala may have appeared likable to viewers, Mills said, he left the opposite impression on him when they sat together in the show's Green Room, where contestants waited before going on air.

"He was quiet, but at the same time he would interrupt and impose when he felt like it," Mills said. "And he was very obnoxious and creepy -- he became very unlikable and rude and imposing as though he was trying to intimidate. I wound up not only not liking this guy ... not wanting to be near him ... he got creepier and more negative. He was a standout creepy guy in my life."

CNN asked criminal profiler Pat Brown to analyze Alcala's appearance on the show.

"He was aware that he could say things that were considered sexy and funny and the girl would like that," Brown said. "He watched the game and he gave those answers and he won, so he learned some tricks. But a psychopath's true nature comes seeping through.

"When you go back and look, what's most fascinating is that he had already committed a crime," Brown said, "Raped a little girl. Here is a man portraying himself as a desirable young man when he is a violent sexual predator of children."

Two more murders followed the year after Alcala appeared on the show. In June 1979, he raped and murdered 21-year-old Jill Parenteau in her Burbank apartment, the district attorney said.

"The defendant strangled the victim to death using a cord or nylon. Alcala's blood was collected from the scene after he cut himself crawling through a window. Based on a semi-rare blood match, Alcala was linked to the murder," the district attorney's Web site said.

Though he was charged with murdering Parenteau, the case was dismissed after his first conviction in the Samsoe case.

In that case, Alcala approached the 12-year-old at the beach in Huntington Beach and asked her to pose for pictures, after which she rode off on her bicycle toward a dance class, the district attorney said.

She did not make it. "The defendant kidnapped and murdered Samsoe and dumped her body near Sierra Madre in the foothills of the San Gabriel Mountains," the district attorney's Web site said.

Alcala was convicted for Samsoe's murder in 1980 and sentenced to receive the death penalty, but the conviction was overturned by the California Supreme Court.

A second trial in 1986 resulted in a death sentence, but it was overturned by the 9th Circuit Court of Appeals.

As he awaited a third trial, Alcala's DNA was linked to the murder scenes in the Barcomb, Wixted and Lamb cases. He was charged with the four Los Angeles murders, including Parenteau's.

Anyone with information regarding the identities of the women and children in the photographs found in Alcala's storage locker is asked to contact the Orange County District Attorney's Office or the Huntington Beach Police Department.

The photographs are available from the district attorney's office on CD.

-- CNN's Gabriel Falcon contributed to this report.

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