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Sparring partner. the district attorney said at the time that it was not a random crime, that the victims and killers appear to have known each other. there were never any arrests and tamerlan wasn't ever interviewed by police. another oddity, marijuana was sprinkled on the dead bodies of the three people. their throats were slit. as we said at the top, there's new evidence that tamerlan may have been dealing drugs. authorities do not know for sure if there is any connection but it does heighten sort of suspicion about the murder case. debor deborah feyerick investigates. >> reporter: three me...

Of the house saying there's blood everywhere. >> reporter: the brutality of the murders didn't add up. certainly not in a town like waltham. something else didn't make sense. the victims who were each killed in different rooms in this house were covered in marijuana. investigators describe it as a symbolic gesture. robbery wasn't a motive because police found thousands of dollars in cash. the theory is that the victims knew their killers. >> we have no evidence of a break in the apartment and we have other indicia that the decedents and the assailants were known to each other. we know there ar...

Waltham. something else didn't make sense. the victims who were each killed in different rooms in this house were covered in marijuana. investigators describe it as a symbolic gesture. robbery wasn't a motive because police found thousands of dollars in cash. the theory is that the victims knew their killers. >> we have no evidence of a break in the apartment and we have other indicia that the decedents and the assailants were known to each other. we know there are at least two people who are not in that apartment now that were here earlier. >> reporter: that was 19 months ago but the trail we...