Per ABC News:
In the wake of the revelations about the violent nature of accused marathon bomber Tamerlan Tsarnaev, investigators in the Boston suburbs tell ABC News they are probing whether he may have been involved in an unsolved grisly triple homicide of a former roommate and two others. The murders took place around the tenth anniversary of the September 11 attacks.
“We are looking at a possible connection with the suspect in the marathon atrocity and this active and open homicide in Waltham,” Stephanie Guyotte, a spokeswoman for the Middlesex County District Attorney, confirmed to ABC News.
Tsarnaev, the alleged bombing mastermind who died in a fierce gun battle with police early Friday morning, had been training with one of the 2011 murder victims in an attempt to transition from boxing into a possible career in the brutal sport of mixed-martial arts.
The victims were found in a Waltham, Massachusetts apartment. They had their throat slashed, their heads nearly decapitated. Their mutilated bodies were left covered with marijuana.
The rest here.