April 4 (Reuters) – Oklahoma’s attorney general on Thursday had dropped all but a single claim against Johnson & Johnson and Teva Pharmaceutical Industries Ltd in a closely watched lawsuit alleging the drugmakers helped fuel the U.S. opioid epidemic.

The move by Oklahoma Attorney General Mike Hunter came ahead of an upcoming May 28 trial, the first in the United States to result from roughly 2,000 lawsuits seeking to hold manufacturers of painkillers responsible for contributing to the epidemic.

Opioids were involved in a record 47,600 overdose deaths in 2017 in the United States, according to the U.S. Centers for Disease Control and Prevention.

Hunter dropped the claims after announcing last week that OxyContin maker Purdue Pharma LP had along with the wealthy Sackler family