Living Dead- Simultaneous Rising

Luis hesitated, wondering if somehow his smartphone, not so smart after all, had dialed incorrectly or if he’d woken JT from sleep. Impossible: it was midnight in Vegas, equivalent to six o’clock anywhere else, especially for a night prowler like JT.
...

  JT was silent. Luis detected voices in the background, and not the boisterous discord of the casino or private-suite soirée JT would have sought out. These were unpleasant rumbles, terse officials in a closed environment.

  “You had a body revive,” JT said, almost sadly. “Am I close?”
...

  “JT…?” It came out like a plea, lackey to boss man.

  “How long since ETD?” The query sounded programmed.

  “Four and a half? Five? JT, he got up. He came after us.”

  “Après la mort,” JT chuckled direly, “Am I right?”

  “You gotta tell us what you know,” Luis said.
...

  But the silence wasn’t silence. Metallic pinging sounds Luis had attributed to air circulation vents began to grow. The sounds were being duplicated, not with the uniformity of rain against windowpanes but with the irregularity of palms slapping against a locked door.

  Charlie acknowledged the noise seconds later. Both assistant ME and diener gazed with trepidation at John Doe, tensed for some grotesque new evolution, but the sounds came from elsewhere, Together—as if joint movement made it less frightening—they looked toward the source.

  Often called a freezer or refrigerator, the staff here preferred the hipper, jail-cell connotations of cooler. Supermarket-style automatic doors provided easy passage for workers pushing gurneys into the temperature-controlled room, where metal shelving held bodies for initial examination, family identification, autopsy, or upcoming legal orders. Two battery-charged hydraulic lifts allowed bagged cadavers to be placed on or removed from the highest shelves. Right now, more than a hundred corpses lay in the cooler, in all states of decay.

  From the sound of it, They had begun to awake.

- The Living Dead, chapter: Sixty-Four Floors