The first thing Houston police captain Charles Bullock noticed as he entered 1815 Driscoll Street on the evening of June 23, 1965, was that someone didn’t want him using the back door. Flower pots had been stacked against the entrance, forcing Bullock and his partner, L.M. Barta, to push their way inside. While Barta moved through the rest of the home, Bullock headed for the kitchen.

The two were there to perform a welfare check on the house's occupants, an elderly couple named Fred and Edwina Rogers. Their nephew, Marvin Martin, had grown concerned when he failed to reach them by telephone, and became further alarmed after knocking on their door with no answer. So he had called the police.

As he walked into the kitchen, something nagged at Bullock. He would later recall that the scene “just didn’t feel right.” There are contradictory accounts of what happened next. Some say he saw food stacked on top of—rather than inside—the refrigerator, prompting his curiosity. Others say he was thirsty for a beer on a hot summer evening and wanted to see if there was anything to drink. Bullock himself would say he peered inside the fridge for no particular reason. “I don’t know why I looked in the refrigerator,” he said. “For some reason I just opened it.”

He took a quick inventory of its contents, which appeared to be nothing but shelf after shelf of hog meat. He concluded the Rogers family must have been to the butcher recently. But with the house empty, it looked like it would spoil.

This is a shame, Bullock thought. Someone is letting a whole bunch of good meat go to waste.

He started to close the door when something caught his attention. Inside the vegetable drawer was what appeared to be a woman’s head, her eyes fixed in Bullock’s direction. Bullock froze, then slammed the door shut. When he opened it, the head was still there.

The hog meat would turn out to be flesh of a different sort—the dismembered remains of Fred and Edwina Rogers, drained of blood and missing their entrails. Fred’s head was in the other crisper. His eyes had been gouged out.

The gruesomeness of the crime scene would have been disturbing no matter what. Making it slightly worse was the fact that the autopsies showed the murders had been committed on Father’s Day, and the person most likely to know something about the horrific act was the elderly couple's son, Charles.

Charles, unfortunately, was nowhere to be found.

Fred Rogers, 81, was a retired real estate salesman. His wife, Edwina, 79, was a sales representative. Their Houston home and their activities appeared unremarkable to neighbors. But there was an element to their lives that came as something of a surprise to local residents who would later be questioned by police. The surprise was that Charles lived with them. In fact, he owned the house.

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Charles was 43 and a veteran of World War II. After getting a bachelor’s degree in nuclear physics from the University of Houston, he had enlisted in the Navy and learned to fly planes. He became a seismologist and later spent nine years working for the Shell Oil Company. At the time of his parents’ death, it was not clear whether he was employed.

What was clear was that Charles was a peculiar individual. He would rise before dawn, leaving the house to tend to unknown business before his parents woke up, and then come back after dark, after they went to bed. His travels were so subtle that the next door neighbor was not even aware he lived there.

When he was home, he went out of his way to avoid his parents, purportedly slipping notes under doors when he needed to communicate with them. The family maid would later state that it was possible Edwina had not even seen Charles face-to-face for roughly five years prior to her death.

No one was sure what led to this unusually frigid living arrangement. It’s possible Charles wanted to provide for his elderly parents in spite of either not getting along with them or wishing not to be disturbed by the outside world. Either way, it was now imperative that he answer questions about their gruesome fates.

When Bullock discovered the corpses, he and his partner Barta practically sprinted out of the house, calling investigators to the scene. They found the house had mostly been scrubbed clean, save for some blood in the bathroom—where they believed the bodies had been cut up—and Charles’s attic bedroom, where there were trace amounts of blood as well as a hand saw they believed had been used to perform the dismemberment. The heads, torsos, and limbs were in the refrigerator; the entrails were found in the sewer system, apparently having been flushed down the toilet. Other body parts were missing and never found.

Owing to the labor involved in draining the bodies, carving up the corpses, and cleaning the home, police believed the killer had taken his or her time and had a working knowledge of human anatomy. Autopsies revealed that Edwina had died as a result of a single gunshot to the head, though that weapon was never found. Fred had gotten the worst of it. He had been beaten to death with a claw hammer, his eyes plucked out and his genitals severed from his torso in what was seemingly a vindictive mutilation. The claw hammer was found on the premises, though police would not confirm whether any fingerprints were retrieved.

If there was evidence, authorities wanted to discuss it with Charles. They issued an all-points bulletin and launched a nationwide search. As the only presumably-living member of the household, his insight—if not his confession—would prove invaluable. Because he knew how to fly, authorities checked nearby airfields to see if anyone matching his description had left the area by plane. Nothing turned up. In being so reclusive, Charles left virtually no trail for them to follow.

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“The habits and manners of the missing son are major mysteries,” Captain L.D. Morrison, head of the local homicide bureau, told reporters a few days after the bodies had been found.

It was an understatement. Police never located Charles—not in the weeks, months, or years that followed. In 1975, in an effort to probate the Rogers estate, he was declared legally dead.

One of Houston’s goriest murders would become one of its most notorious unsolved cases. But that hasn’t stopped others from stepping forward and offering their theories about what may have transpired.

Some are outlandish, using the blank canvas of the crime scene to try and attach deeper meaning to Charles’s life. The 1992 book The Man on the Grassy Knoll, by authors John R. Craig and Philip A. Rogers, offered that Charles was actually a CIA operative involved in the 1963 assassination of John F. Kennedy. When his parents discovered incriminating diary entries, Charles killed them.

The Ice Box Murders, a 2003 book written by forensic accountants and amateur sleuths Hugh and Martha Gardenier, made an attempt to present a more plausible theory. They agreed Charles was indeed the killer, but his motive was not the result of any CIA involvement. Instead, the Gardeniers argued that Fred and Edwina were abusive and manipulative parents, doing everything from taking loans out against their son’s home to forging his signature on deeds to other property he owned. After years of being browbeaten and financially ripped off, Charles lashed out in an orgy of violence, smashing his father’s head in. (That his mother got a comparatively compassionate execution-style killing may point to most of the abuse coming from Fred.)

The Gardeniers asserted that a few days after the murders, someone matching Charles’s physical description was overheard asking about a job overseas, using an alias. They claimed that Charles utilized his contacts in the oil and mining industries to land in Mexico. The book also asserts that Charles met a violent end of his own, when a wage dispute involving some miners in Honduras ended with a pickaxe lodged in his head.

The Houston Press labeled the Gardeniers’ book a work of “fact-based fiction and supposition,” leaving its conclusions up in the air. No concrete evidence appears to point to Charles winding up in Central America, though he did at one point own his own plane. Fleeing Houston via aircraft seems plausible, and with the Shell Oil job taking him to Canada and Alaska, it’s also possible he had contacts in another country that could have made setting up a new life easier.

Decades later, it's unlikely the case will ever find resolution. If Charles Rogers did not commit the crime, his disappearance is inexplicable. No one else appeared to have motive to kill his parents. If he was killed by an unknown third party, the perpetrator did an excellent job removing all trace of him. Whether he ended up in Central America or somewhere else, the most likely explanation is that he spent the rest of his days doing what he'd so often practiced at 1815 Driscoll—disappearing into the shadows, unnoticed by the rest of the world.