At about 11:30 am on November 8, 1979, a black man walked into a newly opened antique store in Gretna, Louisiana. The owner, B.N., a 39-year-old white woman, became suspicious. She attempted to direct him to furniture outside, but he grabbed her from behind and clubbed her in the head with a handgun as she walked to the front door. He then forced her into a bathroom at the rear of the shop and raped her at gunpoint.

The trail in the snow led to the middle of Lava Lake, where the missing sled was recovered. On the sled was more blood and clumps of what was believed to be human hair. 

Sources: 

The Unsolved Mystery Of The Lava Lake Murders (grunge.com)

The Lava Lake Murders: One of Oregon’s Oldest Unsolved Crimes (the-line-up.com)

Lava Lake murders - Wikipedia

Offbeat Oregon: Lava Lake murders are still officially unsolved, but … | Community | tillamookheadlightherald.com

Sources: 

Robert William Fisher | Murderpedia, the encyclopedia of murderers

Robert William Fisher - Wikipedia

475. Robert William Fisher — FBI

Arizona fugitive Robert Fisher removed from FBI 10 Most Wanted list (azcentral.com)

Summary:

He planned to bring a group of boys together, allow them to make friends, then separate them into two factions to compete for a prize. He believed they would forget their friendships and start demonizing one another at this point. The piece de resistance was to come at the end: he planned to set a forest fire in the vicinity of the camp. The intentional forest fire would force the boys to work as one team again, facing a shared threat.

Sources:

Book: the Lord of the Flies by Gina Perry 

Robbers Cave Experiment: How Group Conflicts Develop - PsyBlog (spring.org.uk)

Robbers Cave Experiment (SOCIAL PSYCHOLOGY) - iResearchNet

Robbers Cave Experiment / Realistic Conflict Theory | Simply Psychology

A real-life Lord of the Flies: the troubling legacy of the Robbers Cave experiment | Psychology | The Guardian

‘Come on out and fight!’: an extract from The Lost Boys by Gina Perry | Psychology | The Guardian

The Robbers Cave Experiment: Realistic Conflict Theory - Explore Psychology

One beautiful girl, two extravagant and prominent men. Throw in jealousy and a family history of mental instability and you have the recipe for a shocking murder, at an outdoor theater in the heart of New York City in front of nearly a thousand witnesses. The trial that followed was quickly dubbed "the trial of the century." The 1907 trial, and a second the next year after the first jury hung, helped closed the curtains on America's "Gilded Age."

Sources 

Evelyn Nesbit - Wikipedia

The Love Triangle | American Experience | Official Site | PBS

Evelyn Nesbit, Harry Thaw, Stanford White, And The Trial Of The Century (allthatsinteresting.com)

Evelyn Nesbit and “the Trial of the Century” – PortableNYC – New York history, architecture and secrets (portablenycblog.com)

Historian writes true-crime account of Evelyn Nesbit scandal (brooklyneagle.com)

Story of Evelyn Nesbit and the Thaw-White Murder

The 100-Foot Gibson Girl: A Symbol of Abuse, Then and Now - The New York Times (nytimes.com)

The Trials of Harry Thaw for the Murder of Stanford White (famous-trials.com)

Found in Port St. Lucie, the Devil Tree is a big oak in a county park on canal C-24. A mighty oak, an ordinary tree, nothing to write home about…except the fact that thing might as well growl and snatch up little old ladies and unsuspecting kids and gobble them up like a throwback from a Grimm Fairy tale. The Devil Tree has an evil, macabre, and incredibly blood-soaked reputation; one that’s entwined with Florida history and its amazing capacity to attract the worse of the worse that humanity has to offer.

Sources

Gerard John Schaefer - Wikipedia

The Devil Tree – Florida’s First Serial Killer & The Hauntings He Left - Miami Haunts

CRIME HUNTER: How 'damn weird' Florida cop became a serial killer | Toronto Sun

UNTANGLING TORTURED WEB OF A KILLER - Sun Sentinel (sun-sentinel.com)

Gerard Schaefer Jr.’s horrifying 'Killer Fiction' stories could have been filed on memoir shelf - New York Daily News (nydailynews.com)

Gerard Schaefer: Serial Killer Cop | by DeLani R. Bartlette | Lessons from History | Medium

Gerard Schaefer | Murderpedia, the encyclopedia of murderers

The Sexual Sadist | Officer

Intellectual disability involves problems with general mental abilities that affect functioning in two areas:

Intellectual disability affects about one percent of the population, and of those about 85 percent have a mild intellectual disability. Males are more likely than females to be diagnosed with intellectual disability.

Sources: 

Atkins v. Virginia | Oyez

Roper v. Simmons | Oyez

Hall v. Florida | Oyez

Atkins v. Virginia - Wikipedia

Hall v. Florida - Wikipedia

Roper v. Simmons - Wikipedia