David Allen Lucas

There were two things handwritten inside, one saying "Love Insurance" and the other "280–1700".

During the investigation, police determined that the killer had slit Colin's throat in the bathroom, but that the boy did not lose consciousness immediately - he managed to make it to the hallway, where he collapsed on the floor and died.

Suzanne, on the other hand, was likely killed in the bedroom, due to the amount of broken furniture and other signs of a struggle.

Coroners noted that she fiercely resisted her attacker, as they found large strands of blonde hair in both of her hands, which she likely pulled out of from the killer's hair.

Suzanne had been stabbed twice in the back and once in the abdomen, damaging her liver, but was left fully clothed and did not seem to be sexually assaulted.

She was killed when the killer slit her throat, leaving splotches of blood on the adjacent furniture, floor, sheets and even the door.

While examining the crime scene, law enforcement officers found several bloody footprints on the floor with the distinctive tread of men's shoes with a distinctive sole belonging to the Vibram brand.

All the footprints were the same size and had the same pattern, leading investigators to conclude that the killer likely acted alone.

According to forensic pathologist David Katsuyama, the perpetrator slit the victims' throats with such force that he left gaping wounds that exposed their spines.

In Katsuyama's opinion, the wounds were inflicted with a medium-length knife with a sharp, relatively stiff blade.

David Allen Lucas (born 1956) is an American serial killer who committed between three and six murders in San Diego County, California from 1979 to 1984.

Due to the fact that all the victims had their throats slashed, the case was dubbed The Throat-Slash Murders.

After one of the most prolonged trials in the city's history, Lucas was found guilty of three of the murders and sentenced to death, and remains on death row.

Not much is known about the early life of Lucas.

Born in 1956 on an American military installation in the Philippines, he was one of three children born to naval officer Clarence Lucas and his wife Patricia Katzenmeier, who moved back to the United States when David was still young.

From an early age, David began to experience health problems, being diagnosed with bronchial asthma and nocturnal enuresis.

His childhood was fraught by the destructive behavior of his father, who physically and sexually abused his children and spouse.

According to the Lucas children's recollections, Clarence would fly into fits of rage and destroy furniture, have frequent arguments with their mother and would frequently beat them with a belt, telephone cable or his bare hands.

David's siblings would later claim that most of this abuse was centered around him, a claim which he would confirm later on in life, stating that his father frequently subjected him to various other forms of humiliation.

One such incident included forcing his sister to eat her own vomit after she became nauseous at a family dinner.

In 1971, David's parents divorced, after he, his siblings and their mother moved away.

Two years later, when he was 18 years old, he was arrested for raping a 21-year-old maid who worked for a family friend and was incarcerated for an unknown amount of time.

After his release, Lucas married a woman named Shannon and moved to Spring Valley, where he opened his own carpet cleaning business with the help of his friend, Frank William Clark.

According to investigators, Lucas committed his first murders on May 4, 1979, with his victims being 31-year-old Suzanne Camille Jacobs and her 3-year-old son, Colin, who resided in Normal Heights.

On the day of the murder, Suzanne's husband Michael woke up in the morning and went to work, leaving the house at 6:00 AM.

Margaret Harris, a neighbor of the family who lived across the street from the Jacobs household, later stated that after Michael left, between 8:00 and 9:00 AM, a dark maroon colored sports car with a black top pulled up to the house.

Between approximately 11:00 and 11:30 AM, Harris made a telephone call to Suzanne Jacobs to invite her to go bicycling, which went unanswered.

At approximately the same time, Michael called her workplace, but also received no response.

At 12:30 AM, a courier named Louis Hoeniger showed up at the Jacobs' home to deliver a dinette set that they had ordered the previous day.

Without waiting for them to answer, he left the package on the porch and left.

At about 5:00 PM, Michael Jacobs returned home, and upon entering the house, he discovered the body of his son.

Shocked, he ran to the Harrises' house, and after explaining what he had seen, they returned to the Jacobs home, where they found Suzanne's body in the bedroom.

After arriving on the scene, police officers found a significant amount of blood in the bathroom and in the hallway.

While inspecting the bathroom, officers noticed that the mat had been folded, and that there was a torn piece of paper.

On May 11, 1979, laboratory technician Pat Stewart took several photographs of the torn piece of paper and applied ninhydrin, a chemical used to detect partial fingerprints.

Three days later, the San Diego Police Department fingerprint examiner Leigh Emmerson examined a partial fingerprint on this piece of paper and found five or six identifiable dots, which he felt were insufficient to determine who the print belonged to, but could be used to eliminate potential suspects.

On December 8, 1981, the body of 29-year-old realtor Gayle Roberta Garcia was found in a vacant property in Spring Valley, having evidently been killed by having her throat cut.

On that day, she had driven to the property intent on showing it to at least three potential renters, one of whom was never identified.

The similarity of her murder led some to believe that she was killed by the same man who had killed the Jacobses and the latter victims.

On the evening of June 8, 1984, Lucas, according to investigators, assaulted 34-year-old Jodie Santiago Robertson, a visitor from Seattle, Washington, who was visiting friends in El Cajon.