Should I warn my friend that my ex-best friend is a narcissist?

Silverware
I was best friends with this girl for 4 years. It wasn't until recently I had discovered she had narcissistic personality disorder. We have several mutual friends together, but a couple of these friends I am close with and I feel like I should warn them about my ex-friends behaviour. Should I tell them? I also feel like my ex-friend may be trying to turn them against me and I don't know what to do... any advice would be very helpful. Thank you.
Should I warn my friend that my ex-best friend is a narcissist?
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