anthony zayer was a student and at a fraternity party near cornell early sunday morning. the family says he was leaving with a friend, the friend bumped into a woman. that led to a fight that ended with anthony being stabbed to death. police say this is the first homicide in the city since 2011. police have not -- >> a lot of information, we have a co on scene, we have police officers, witnesses, people that, again we're reaching out to that are submitting stuff to us on facebook, snapchat, instagram. all that stuff. >> police haven't announced any arrests but anthony's sister says police told the family they have a suspect. anthony's friend was also stabbed, he was treated and released from the hospital. >>> investigators now say tanks of nitrous oxide caused a the explosions killed one employee but the company hasn't released his identity. investigators say they have found no signs of foul play and are calling this an accident. dentists often use nitrous oxide "laughing gas" on patients during procedure, it's also used on fuel in racing cars. >>> new travel options comi