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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 went cold. no arrests, no named suspects. but...

Older brother who died in a shootout with police. deborah feyerick has more for you. >> reporter: it happened on this quiet street in massachusetts. the men nearly beheaded, their throats slit ear to ear. >> there was a girl running out of the house saying there's blood everywhere. >> reporter: the brutality of the murders didn't add up. not in a town like this. something else didn't m sense. the victims each killed in different rooms of the house were covered in marijuana. investigators describe it as a symbolic gesture. robbery wasn't a motive because police found thousands of dollars in cas...

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 went cold. no arrests, no named suspects. but the attack on the boston marathon revived interest in the case because one of the victims, 25-year-old brendan mass, was close friends with b...

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...

Of the house saying there is blood everywhere. >> reporter: the brutality of the murders didn't add up. certainly not in a town like walltham. something else didn't make sense. the victims each killed in different rooms of the 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 everyoindicia that t assailant and victims were known to each other. we know there are two peop...