No, this is society's fault for lowering the age of consent to 17. If it was at 18, then this girl would have waited until she was a few months older to have sex and no-one would have died! Or at very least, the police would have the legal authority to make that girl pick a better boyfriend and respect her mother.
Alternative title:
My daughter is dating an older boy with a troubled past and instead of acting like a parent I'm freaking out because the police won't stop them from dating and INTERNETZ!!!
Wait, why is it at all significant that she met him on the internet? He lives in the area, she could easily have met him at a coffee shop and their relationship would be no different.
Imagine the disappointment when thousands of teenage girls went online looking for 23 year old boyishly handsome armed robbers and found mostly fat guys pretending to be characters from the Lion King.