Eduardo Sencion (also known as Eduardo Perez-Gonzalez; July 22, 1979 – September 6, 2011) was born in Mexico and had a valid U.S. passport. He had no previous criminal history and worked at his family's business located in South Lake Tahoe. Diagnosed with paranoid schizophrenia when he was eighteen years old, he had no traces of antipsychotic drugs in his body on the day of the massacre, according to toxicology reports. In January 2009, he filed for bankruptcy, listing more than $42,000 in outstanding debts for a car, several credit cards, and medical expenses. His motive for the attack is unknown by law-enforcement officials, though there was no indication that it was a terrorist attack, and that he had no known connection to the military, nor motivation for shooting the National Guardsmen.