He used the online nicknames "Rosenboy" or "Riddick300" on the chat rooms, the latter after a fictional serial killer in the gory 2000 science-fiction movie Pitch Black with Vin Diesel, daily Die Welt said.
With the first woman, who went by the internet name "babylove", Grotheer got into a heated argument, during which he only "touched her on the throat" when to his horror she suddenly dropped dead, his lawyer said.
Women are also expected wear a traditional head covering called a hijab, and in some areas a face-veil, niqab, is also customary.
Online chats between men and women are forbidden in Islam, a prominent Saudi cleric has said, explaining that a virtual conversation is comparable to the forbidden situation of a man and a woman alone in a private area.
Sheikh Abdullah al-Mutlaq, a member of the Saudi Committee of Senior Scholars, warned Muslim social media users that conversing online may lead to sin, as "the devil would be present when women talk to men," the Al-Arabiya website reported Thursday.
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