Marianne Verdecchia was a 10-year-old from Pittsburgh, Pennsylvania. She was raised by her aunt and loved to visit people in the neighborhood.

Marianne disappeared on June 7, 1962. Her mystery was the last of three still unsolved cases to occur not just in the same building, but on the same floor over the course of four years.

A woman Mary Regan was murdered, and two people, Marcella Crulsie and Marianne were never seen again.

I'm Ed Denzel, and this is Unfound.

The human brain is a pattern deciphering machine. This is the exact reason that if you've ever taken an IQ test, you aren't asked what the capital of Florida is, Tallahassee.

Instead, you're asked to predict the next squiggly line in a series of squiggly lines. For missing persons, when we're trying to find connections between cases, we are essentially doing the squiggly line thing.

Is this disappearance related to that one? Is there a pattern? And this isn't always an easy question to answer.

Most prominently for Unfound, we've covered the disappearances of Cameron Remmer and Jackson Miller.

Two men who disappeared from San Francisco under similar circumstances. In fact, there are three other men just like them.

Sean Citi, Christian Hughes, and Sean Dickerson, who also disappeared from that city, within blocks of each other over five years' time.

Maybe they're connected. Yet I have to tell you my opinion. There's no pattern to say all five are related to each other, despite appearances to the contrary.

Well, today you're going to get to hear about three females, and their cases happened over only four years, and not just in the same city, and not just in the same building.

Today, tried to decide if there is a connection between the mysteries on the fifth floor.

And now, a summary of these three cases, these are partially brought to you by my friend Megan Lynaz's website, CharlieProject.org.

Mary Ann Verdecchia, on school days, would come home and immediately get out of her uniform. She would then walk over to the fifth floor of the Martinique apartments to visit a woman she knew, Gene Emory, who had a cat.

That day, June 7, 1962, Gene sent Mary Ann out for cat food. Mary Ann came back, hung around for a few minutes, according to Gene, then left.

The building manager allegedly saw Mary Ann leave, and across the street. She was never seen again.

An investigation discovered that Gene was actually a prostitute, who had clients going in and out all the time.

Three years earlier, on November 19, 1959, Marcella Crossy, a 30-year-old who lived alone on the fifth floor of the Martinique, was last seen eating at the restaurant on the ground floor of the building.

When Marcella did not show up for work the next day, an investigation started. There were no signs of violence or anything unusual in her place, and her diabetes medication had been left behind.

She was never seen again. That investigation could not determine whether Marcella went back to her apartment or not.

Not at the time, or since then, have police been able to connect her case in any way to this following one.

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