The underage prostitute was there, doing drugs at Henley's house (she was arrested for prostitution). That part isn't in question, though she didn't "OD". This is the incident Henley wrote the song "Dirty Laundry" about.
Henley plead no contest to "contributing to the delinquency of a minor", paid a fine and probation. This isn't about that case, but some guys who ripped Henley off getting to use this incident to impeach him as a witness. They are hoping to embarrass Henley to force a settlement. Henley is worth at least $200M-$250M and still touring with the Eagles at large venues. This is probably personal for him to pursue it this far.
“That part isn’t in question, though she didn’t “OD”.”
OD has had different definitions — fatal or not — over time and depending who you ask.
The girl did go into convulsions and hyperthermia and death can follow that easily but didn’t.