Looks like the caught the person that did this according to a post on tripadvisor.
This is what was posted:

Le Pelican news report on FB:

Resolution of the murder of Wendy Montulet

The perpetrator was arrested yesterday. He's 21 years old, and is a native of Saint-Martin. He bumped into the young woman in the shrubbery, took a piece of glass and suffered some blows. The prosecutor has also confirmed that the young tourist has been sexually assaulted.