She definitely did give it to him, but recently my friend told me about an even more disturbing theory: that she OD'd him on purpose. Apparently he saw a documentary in which a compelling enough case was made to cause him to really consider it. What her motive would have been is my trouble w/ this theory (w/o seeing the doc). If they were so close, and Sid was at what you could call the pinnacle of his success, why would she kill him? Of course, it can be proposed she killed him indirectly by providing the drugs.... but intentionally?
Sid always struck me as a very sad and tragic character - a kid who laid the template for much of the obnoxious behavior to proliferate through punk culture (a lot of it was already there, but he personified and championed it as an icon). Ironically, it is b/c of this crudeness I can empathize w/ him most: as a teenage punk rocker, there was an impulse and occasional attempts to imitate many things Sid probably would have done, and it was all done to strike an image. Since I emulated his behavior at times for the same reasons he did (to earn peoples' acceptance), I pity him more. He just did not seem to have much going on outside of a look and vulgarity and drugs - the latter of which he was not very good at - from what I have read. Still, it is sad he immolated himself over his image - talent or no.
Since I remember there being some mention of Johnny T. earlier in this thread, the circumstances surrounding his death in New Orleans are pretty odd as well. And Johnny Thunders was a talent.
EDIT: not to mention Stiv Bators seemingly needless accidental death in Paris....
Anyway, Elvis, yeah?