On the evening of August 4, 2009, a forty-eight-year-old systems analyst walked into an LA Fitness gym in Collier Township, Pennsylvania, set down a duffel bag near the back of a crowded women's aerobics class, and turned off the lights. In the darkness, he opened fire. By the time the shooting stopped, three women were dead, nine more were wounded, and George Sodini had turned the gun on himself. What investigators found afterward was a digital trail that stretched back months, a blog that read like a countdown to mass murder. THE VICTIMS: Heidi Overmier was forty-six years old, a woman described by friends as warm and generous, devoted to her fitness routine. Jody Billingsley was thirty-seven, a mother and nurse who had recently returned to the gym after taking time off. Elizabeth Gannon was forty-nine, a longtime member of the Tuesday night aerobics class. Nine other women sustained gunshot wounds and survived. THE PERPETRATOR: George Alfred Sodini lived alone in a home in Scott Township, a suburb of Pittsburgh. He worked as a systems analyst and by outward appearances led an unremarkable middle-class life. But behind closed doors, Sodini nursed a consuming bitterness toward women and society. Beginning in November 2008, he maintained an online blog that documented his growing rage, his isolation, and his explicit plans to commit a mass shooting. The entries detailed years without romantic relationships, obsessive record-keeping of how long it had been since any woman showed interest in him, and a methodical countdown to what he called his exit plan. THE FAILED FIRST ATTEMPT: On January 6, 2009, Sodini went to the same LA Fitness gym with the same intent. He brought his weapons, sat in his car, and ultimately could not go through with it. He wrote about this failure on his blog, chastising himself for losing his nerve. For the next seven months, the blog continued, the entries growing darker, more resolved, more certain that he would follow through. THE INVESTIGATION: After the shooting, investigators discovered Sodini's blog, which he had updated as recently as the day of the attack. They also found a note at his home and a detailed will. The blog entries revealed that multiple warning signs had been visible for months to anyone who might have looked. Sodini had attended self-improvement seminars, visited a church regularly, and interacted with coworkers daily. Yet no one recognized the depth of his despair or the specificity of his plans. SIGNIFICANCE: The Collier Township shooting became one of the earliest cases studied in the context of what researchers would later call involuntary celibate ideology. Sodini's manifesto-style blog, his fixation on romantic rejection, and his targeting of women in a fitness class established patterns that would recur in subsequent acts of mass violence. Learn more about this case at https://www.mythsandmalice.com/show/obscura/ Support Obscura: https://www.patreon.com/obscuracrimepodcast/