I dont remember the year, but there was a similar case in alipur zoo, kolkata where a drunk man went into the tiger enclosure after betting with his friend that he would put a garland around the neck of the tiger named shiva. Two of the men went inside, both were killed(?)..the guy is said to have succeeded in putting the garland on tiger, but only at the cost of his life.
This case what I hear from the eye witness is that they dont know how this chap went into the enclosure but the tiger sniffed him for around 7-8 minutes before grabbing him by his neck and running towards his den