This is very sad and, as Cam has already stated, could turn into another emotionally laden (but factually bare thread).
But one glaring error needs to be corrected, both in the thread and in the title - this was a robbery which was perpetrated on persons on a boat, not piracy.
According to Merriam-Webster's Dictionary:
Main Entry: pi·ra·cy
Inflected Form(s): plural pi·ra·cies
Etymology: Medieval Latin piratia, from Late Greek peirateia, from Greek peiratēs pirate
1: an act of robbery on the high seas ; also : an act resembling such robbery
2: robbery on the high seas
3 a: the unauthorized use of another's production, invention, or conception especially in infringement of a copyright b: the illicit accessing of broadcast signals
Main Entry: rob·bery
Inflected Form(s): plural rob·ber·ies
Date: 13th century
: the act or practice of robbing ; specifically : larceny from the person or presence of another by violence or threat