If You Really Want to Celebrate Earth Day the Authentic Way...
...well, hopefully, you won't.
On September 9, 1977, Ira Einhorn, one of Earth Day's co-founders, lured his ex (the 'ex' portion occurring pre-brutal murder) girlfriend, Holly Maddux, to his apartment and killed her in a heartbroken rage. Though, he did choose to dispose of the body by composting her. So at least he's consistent.
It took seven months for the police to discover what had happened, and just days before his murder trial was set to begin, Einhorn—or as he preferred to be called, the Unicorn—fled to Europe, where he enjoyed a 17-year holiday from the law, avoiding extradition and marrying a Swede along the way. He was at last sent back to face the consequences on July 2001, and is currently serving a life term in prison without the possibility of parole.