Remember these notable St. Louis-area serial killers?

Halm was married to a dental hygienist, Carmen Miranda Halm, who worked in Engleman's office. His widow testified that she and Engleman plotted for her to marry so they could kill her husband for insurance money. Jurors found Engleman guilty of the various charges in 1980 and 1981. (She received immunity for her testimony.)

After his convictions in those deaths, Engleman was charged with killing Arthur Gusewelle and his wife Vernita, in November 1977; and their son Ronald, who died in April 1979. Engleman pleaded guilty to the three murders in June 1985. Ronald Gusewelle's widow, Barbara Gusewelle Boyle, was also convicted of murder for her husband's death. Engleman plotted to kill the couple, and then Ronald Gusewelle, for insurance money that he split with the widow. 

Engleman died in prison in 1999.

He was never charged with the 1958 shooting death of James Bullock, who had married Engleman's first wife after she divorced the dentist. Bullock was found shot near the Art Museum in Forest Park, and the investigation and questioning of Engleman and the widow was closely followed in the news. 

He was also never charged in the 1963 death of business partner, killed in an explosion that, at first, looked like a work accident. Eric Frey died at the dragstrip near Pacific that Bullock's widow invested in after she received $64,500 in insurance money. Engleman was a director at the dragstrip.

Engleman's defense attorney said, in 1985: "No, his motives were not money. He would treat people for nothing, and there were acts of kindness and charity in his background. 

"I think probably his desire to control individuals was his driving force — to make all the little dummies walk in line and sing at the same time."

During his trial, defense attorneys said that Fayne was mentally disabled with a low IQ. They also described an abusive childhood, including a rape at a juvenile center when he was 10 years old.

In confessions to police, Fayne said he first killed someone because he wondered what it would be like to break someone's neck.  

Victims

• 1989: Aree Master Hunt, 6, of Centreville, was beaten to death under a highway overpass in Frank Holten State Park.

• 1992: Faith Davis, 17, stabbed to death when she interrupted a burglary.

• 1992: Fallon Flood, 9, strangled at East St. Louis Senior High School.

• 1993: Glenda Jones, 17, was stabbed to death in a secluded area behind Martin Luther King Jr. High.

• 1992: Latondra M. Dean, 14, attacked and stabbed as she crossed a field to her East St. Louis home.

Franklin wasn't charged with the crime until 17 years after it happened, when he was serving life sentences in Illinois for other murders. 

Flynt was shot in March 1978 in Gwinnett County, Georgia. Franklin, in a letter years later, confessed to that shooting (then said it was a hoax). Franklin said a Hustler photo of an interracial couple infuriated him.

Besides the Missouri murder, he was also convicted for killing an interracial couple in Wisconsin and two black men, jogging with white women, in Salt Lake City.

Franklin confessed to more than 20 murders. He was executed in Missouri in 2013 at 63 years old. 

Gifford was arrested in August 1928; jurors found her guilty, but insane in November. By then, people suspected she killed up to 18 people, "at whose bedsides [she] was a volunteer nurse and who died suddenly." She was even suspected in the death of her first husband in Hillsboro. 

"When the physicians taxed her with poiston murders, tears stood in her eyes, her nostrils dilated, and she said in her quaking voice: "But I wanted to help them. I wanted to do good," read the 1928 article about her conviction.

Hill also pleaded guilty to a murder in Arkansas, the strangling death of Marissa Lowe, 40, of Forrest City, Ark. He was charged with another Arkansas murder, of Katherine Dawson, 48. 

Some of his victims were killed after doing drugs with Hill; in another case, police say Hill went into a rage after smoking crack and suffocated a victim with a pillow.

Hill is currently serving a life sentence at the Southeast Correctional Center in Charleston, Mo.

Imprisoned in 1983 for sexual offenses, Krajcir was connected to the murders after DNA evidence was analyzed decades after the murders.

In 2008, detectives listened for four hours as Krajcir detailed his crimes. He confessed after prosecutors promised to waive the death penalty for his crimes.

Krajcir selected victims at random, and didn't kill all the women he attacked. In at least one case, an innocent man died in prison after being convicted of attacking a woman who was really stabbed by Krajcir. 

Victims

• August 1977: Mary Parsh, 58, and Brenda Parsh, 27, a mother and daughter killed at Mary Parsh's home in Cape Girardeau. Krajcir raped Brenda, and killed both women.

• November 1977: Sheila Cole, 21, who was abducted from her car in a Walmart parking lot, then shot and killed after Krajcir raped her.

• May 1978: Virginia Lee Witte, of Marion, Ill., who died of strangulation after going grocery shopping. 

• March 1979: Joyce Tharp, of Paducah, Ky., whose nude body was found behind a church 

• 1979: Myrtle Rupp, 51, of Berks County, Pennsylvania

• January 1982: Margie Call, 57, who was raped and strangled in her home a week after Krajcir saw her in a grocery store parking lot.

• June 1982: Mildred Wallace, 65, who Krajcir followed home from a grocery store. While entering the home through a window he broke, Krajcir cut himself on glass, leaving DNA that linked him to the crime. He raped and shot her.

• April 1982: Deborah Sheppard, 23, a student at Southern Illinois University-Carbondale. DNA left at the scene of her murder linked Krajcir to her death.

He was sentenced to death for the killing of Mary Fleming, 18, of St. Charles, who was murdered in July 1980. She interrupted a burglary at her home, and LaRette slashed her throat then stabbed her in the chest. LaRette was convicted in 1981. 

In October 1988, he called a Missouri investigator from prison and began confessing. In the end, he confessed to more than a dozen killings, and gave details about other murders.

Before he was sentenced for killing four women, he raped four others; he had been in prison for years before the four murders in the 1980s. He and two of his victims lived in the same apartment building.

Victims

• 1985: Rose Jackson, 60, of the 2700 block of Hampton Avenue, was killed in anger when she wouldn't give him money, according to a confession. 

• 1987: Sister Patricia Kelley, 50.

• 1988: Imogene Jackson, 28 (unrelated to Rose Jackson), was raped and strangled in her apartment at the Saum.

• 1988: Doris Hayes, 48, of the 2900 block of Hickory, was a guard and teacher at the St. Louis Training Center, which Little attended; she was strangled in her home in the 2900 block of Hickory Street. 

The Ferguson resident apparently had plans to build cells in his basement, where police found several videotapes of Travis with some of his victims. He lived in the 1000 block of Ford Drive.

In 2002, Post-Dispatch reporter Bill Smith wrote a profile of one of the victims; five days letter, Smith got an anonymous letter claiming credit for 17 murders. The letter included a computer-generated map to a location where police found a body. That map allowed police to find Travis.

Police described Travis' victims as drug-addicted prostitutes. Some had never been reported missing, making identifying bodies difficult. DNA linked him to several of the victims.

Victims

• Alysa Greenwade, found in 2001 (formally charged)

• Teresa Wilson, 36, found in 2001 (Court documents link him to her death)

• Betty James, 46, found in 2001 (formally charged)

• Verona Thompson, 36, found in 2001 (Court documents link him to her death)

• Yvonne Crues, 50, found in 2001 (Court documents link him to her death)

• Brenda Beasley, 33, found in 2001 (Court documents link him to her death)

• Cassandra F. Walker, 19, found in 2001

• Several unidentified women

Other clerks were killed at small stores along Interstates 70 and 35 between Indianapolis and Wichita, earning the killer the "I-70 killer" nickname.

In 2016, police offered a $25,000 reward for a unique gun that may have been used in the killings. The Erma Werke ET-22 is a long rifle caliber, semi-automatic pistol with a luger action and an 11.75 inch barrel.