6. Richard Ramirez
Before media outlets officially dubbed him "The Night Stalker," Richard Ramirez was called both "The Walk-In Killer" and "The Valley Intruder," since his first few victims were found dead inside their homes. By the end of his spree, the El Paso, Texas, native killed 13 people and almost killed five others. And his methods of execution were especially revolting.
One victim, 44-year-old Maxine Zazzara, had a "T" carved onto her left breast and her eyes gouged out; another woman had pentagrams drawn onto her thigh with lipstick; others had their throats slit after being sodomized.
Hoping to find reasons as to why Ramirez went so bad, reports have cast blame on a cousin named Mike, a Vietnam veteran who showed a young Richard pictures he'd taken of tortured Vietnamese people, specifically decapitated women the young boy had earlier seen in other pictures giving Mike blow-jobs. Even worse, a 13-year-old Richard watched Mike shoot his wife to death, which left Richard covered in the woman's blood.