death inside the second floor unit monday afternoon. >> it does look like the assailants and the decedents did know each other. we have no evidence of a break in the apartment, and we have other that the decedents and the assailants were known to each other. >> 24 hours later state and local police were looking for clues and a motive. all the victims were reportedly covered in blood and marijuana. their names have still not been released. >> we now know the names of the three young men who were killed that day. in the nearly two years since they were killed, we're no closer to know who killed brendan mess, erik weissman, and raphael teken. or why. the only new news we do have is in the form of anonymous law enforcement leaks to the media that say the killers are two men who are now also dead. one of them, the elder boston bombing suspect, tamerlan tsarnaev, and the other, a man named ibragim todashev who was killed by the fbi in florida last month in circumstances no one will explain on the record. joining us now is susan zalkind, a close friend one of the