The medical examiner is still investigating why a 33-year-old California man died Monday night when he was restrained after allegedly stealing beer from a Waikiki store.

The Medical Examiner's Office identified him as Humberto Murillo of San Fernando, Calif.

Police classified the case as an unattended death and a robbery.

At about 8:49 p.m., police said, Murillo walked out of the ABC Store at the Diamond Head end of the Hyatt Regency, 2424 Kalakaua Ave., with a couple of cold packs of beer without saying anything. The cashier notified her manager, who found Murillo on the second floor of the hotel and asked him for a receipt, police said.

Witnesses said the men struggled in front of a golf shop as a crowd gathered and the cans of beer rolled across the floor.

Murillo began assaulting the 29-year-old manager, police said.

The manager called for help, and a 20-year-old hotel guest responded by helping to subdue Murillo, police said.

“;He just hold him,”; said a witness who works at a shop in the Hyatt Regency. “;He never punched him.”;

The manager told Murillo he would release him if he would stop resisting, but Murillo allegedly said he would kill him if he got free, police said.

“;Suddenly he's unconscious,”; said the witness, a woman who asked not to be named. “;I think he had a heart attack, because suddenly he stopped.”;

Hotel security officials performed cardiopulmonary resuscitation on Murillo, who was taken to a local hospital, where he was pronounced dead, police said.

Maggie Donaldson, a nearby jewelry store manager who saw the commotion, blamed the alleged robber.

“;He is bad guy,”; she said. “;Why he steal something from somebody's store?”;

But she added, “;I don't expect somebody steal two packs beer and die.”;