An ex-federal prosecutor is weighing in on Diddy's assault video -- and she says while this isn't necessarily a smoking gun in the investigation he's facing, it certainly doesn't help him.

We talked to Katie Cherkasky -- who's had years of experience with these sorts of legal matters -- on "TMZ Live" Friday ... where she declared that the now-viral video, in which Diddy can be seen beating Cassie -- should make him and his camp worried.

FOLLOW ALL TMZ PODCASTS: https://www.audio.tmz.com/

About TMZ:
TMZ has consistently been credited for breaking the biggest stories dominating the entertainment news landscape and changed the way the public gets their news. Regularly referenced by the media, TMZ is one of the most cited entertainment news sources in the world.

Subscribe to TMZ on YouTube for breaking celebrity news/ gossip and insight from the newsroom staff, the best clips from TMZ on TV, Raw & Uncut TMZ video (from TMZ.com) and the latest video from TMZ Sports and TMZ Live!

We love Hollywood, we just have a funny way of showing it.

Need More TMZ?
TMZ Website: http://tmz.me/fPrTwZt
LIKE TMZ on Facebook! http://tmz.me/9sGB00a
FOLLOW TMZ on Twitter! http://tmz.me/9LeeNWQ
FOLLOW TMZ on Instagram! http://tmz.me/ep7d8Bn
TMZ on TV & TMZ Sports on FS1 Tune In Info: http://tmz.me/ccuirUZ
TMZ is on iOS! http://tmz.me/ecOjgiH
TMZ is on Android! http://tmz.me/pkwieRA

Got a Tip?
Contact TMZ: http://tmz.me/UsxYCvE

Check out TMZ Live, TMZ Sports and toofab!
TMZ Live: http://tmz.me/GxCXCfl
Subscribe! TMZ Live: http://tmz.me/cLxA82p
TMZ Sports: http://tmz.me/jMBERbb
Subscribe! TMZ Sports: http://tmz.me/jMBERbb
Toofab: http://tmz.me/dsXztns
Subscribe! toofab: http://tmz.me/VeVLMmi


https://www.youtube.com/c/TMZ