What is ketamine, the drug involved in Matthew Perry's death?

FILE - Actor Matthew Perry participates in the BUILD Speaker Series to discuss the mini-series "The Kennedys After Camelot" in New York on March 30, 2017. (Photo by Evan Agostini/Invision/AP, File)

The investigation into the death of “Friends†star Matthew Perry has led to a sweeping indictment that pulled in five people who prosecutors say contributed to his ketamine overdose in October, including two doctors and a street dealer involved in providing Perry large amounts of the powerful anesthetic.

Here's what to know about ketamine.

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