Cinco de Mayo Murders

The Cinco de Mayo celebration by Gringos and Hispanics n Sierra Vista, Arizona, culminates at the same time the crime spree of a serial killer comes to a halt. Unlike most serial killers who take a memento from their victims, this one leaves a token, but never the same article. At the first crime scene he leaves a stack of pancakes; at the second, a stuffed toy camel; at the third, a dolphin-shaped balloon; at the fourth, a freshly cut iris; and at the fifth, he leaves a picture of Geronimo. What is the significance of these tokens to the murders? Do the killings, starting on May first and ending on May fifth, have anything to do with Cinco de Mayo?