Daily Mail:

[James Wright] quotes [Hendrix's manager Michael] Jeffery as saying: 'I was in London the night of Jimi's death and together with some old friends ...we went round to Monika's hotel room, got a handful of pills and stuffed them into his mouth ...then poured a few bottles of red wine deep into his windpipe....' John Bannister, the surgeon who tried to revive Hendrix at hospital, said he was convinced he had drowned in red wine. Yet Hendrix had very little alcohol in his bloodstream.

Either way: what a tragedy.