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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 wasnt 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, theres new evidence that tamerlan may have been dealing drugs. authorities do not know for sure if there is any connection but it does heighten s...

Of the house saying theres blood everywhere. >> reporter: the brutality of the murders didnt add up. certainly not in a town like waltham. something else didnt 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 wasnt 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 hav...

Waltham. something else didnt 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 wasnt 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 ...