Officials backed away from initial reports that Woodroffe was the principal suspect in Arevalo's killing.
Arevalo and Woodroffe were both killed Thursday in the indigenous community of Victoria Gracia, officials said. But police did not begin to investigate until a cellphone video appeared in local media showing a man purported to be Woodroffe begging for mercy while being dragged between thatch-roofed homes. He was then left motionless on the muddy ground.
On Saturday, officials dug up Woodroffe's body from an unmarked grave where he had been hastily buried.
Every year thousands of foreign tourists travel to the Peruvian Amazon to experiment with ayahuasca, a bitter, dark-colored brew made of a mixture of native plants. The hallucinogenic cocktail, also known as yage, has been venerated for centuries by indigenous tribes in Brazil, Peru, Ecuador and Colombia as a cure for all sorts of ailments. But it's also increasingly consumed by Western tourists looking for mind-altering experiences, sometimes with deadly consequences.