Can a stream enterer commit suicide?

There was an incident in the 50s, a monk named [Ñāṇavīra Thera](http://en.wikipedia.org/wiki/Nanavira_Thera) commited suicide, he was believed to be a stream enterer and was suffering from amoebiasis. So I'm curious to know, if someone knows for sure that he's become a stream enterer (or beyond) and doesn't desire to live anymore, can he decide to commit suicide?