Carmel Musgrove, 30, was found dead on a beach in Bora Bora on Thursday (20Aug15).

Musgrove flew out to the tropical retreat to join Silver, who was invited to join the newlyweds on their post-wedding getaway earlier this month (Aug15).

Theroux and Aniston returned to the U.S. for work commitments this week (beg17Aug15).

Island authorities are investigating Musgrove's death.