Police are investigating the source of the ketamine which killed actor Matthew Perry, it has emerged.

Perry, who was best known for playing wise-cracking Chandler Bing in Friends, died at his LA home last October after being found unresponsive in a swimming pool.

A post-mortem found his death was an accident from “the acute effects of ketamine”.

Ketamine is a sedative that can be used as a recreational drug, as well as to treat depression.

Read more: Matthew Perry – A life in…