Source: 2011 slayings of Tamerlan Tsarnaev's friend, 2 others revisited
April 24, 2013 -- Updated 1348 GMT (2148 HKT)
- Tamerlan Tsarnaev's friend and sparring partner was killed in 2011
- The friend, Brendan Mess, and two others had their throats slit
- Source: The crime is being reviewed by "wider group of eyes"
(CNN) -- The slaying of one of Tamerlan Tsarnaev's best friends in September 2011 is now being reviewed by a "wider group of eyes,"a source close to the Boston bombing investigation tells CNN.
The killings of Brendan Mess and two others -- all of whom had their throats slit -- in Waltham, Massachusetts, remain unsolved. The Middlesex County district attorney's office said at the time that the three victims were killed by "sharp force injuries of the neck."
District Attorney Gerry Leone said days after the crime that the victims and two unknown perpetrators appeared to know each other and that it was not a random crime. No suspects were named or arrests made in the case.
Bombing suspect dreamed of being boxer
Boxers call bombing suspect 'a beast'
Bombing suspect linked to jihadist video
Aunt: Suspect more devout after trip
Tsarnaev and Mess were sparring partners at a local gym, and the source tells CNN investigators believe he was one of the last people to see Mess alive.
Aunt reveals clue to Tamerlan's trip to Russia
Investigators of the crime reported at the time that the heads of the three victims were pulled back and their throats slit ear to ear with great force. Marijuana was spread over the bodies in a "symbolic gesture," and several thousand dollars in cash was found at the scene.
On Monday, Middlesex County District Attorney's spokeswoman Mary Beth Long told CNN, "We will review any new information that may come to light in (the triple homicide) as a result of the investigation into alleged marathon bombing suspect Tamarlen Tsarnaev."
Long said the case has always been an open investigation and that they continue to follow all leads.
A sister of one of the victims told CNN that she has been recently contacted by investigators in the case.
"She's meeting with them next week," said CNN's Ashleigh Banfield. "Investigators on that case are meeting with her and have been speaking with her since Saturday. Not only that, she confirms to me that the same detectives are still on that case and that they are detectives that she has spoken with in the past."
Uncle: Cambridge friend 'brainwashed him completely'
The sister, who requested to remain anonymous, said investigators have been very interested in trying to determine if there is any relationship between her brother and Tsarnaev, Banfield said.
"She couldn't really enlighten these detectives at all because she felt her brother wasn't a friend or acquaintance at all of Tamerlan Tsarnaev," Banfield said.
But the sister said she hopes the new interest will lead to her brother's case being solved.
Part of complete coverage on
Boston Marathon Bombings
April 17, 2013 -- Updated 1421 GMT (2221 HKT)
Mistaken identity in the hospital added to her family's grief.
April 24, 2013 -- Updated 1538 GMT (2338 HKT)
The slain MIT cop "was born to be a police officer."
April 19, 2013 -- Updated 0237 GMT (1037 HKT)
The graduate student from China followed her passion to Boston.
April 17, 2013 -- Updated 0510 GMT (1310 HKT)
Almost a year ago, 8-year-old Martin Richard wrote four simple words on a sign at school: No more hurting people.
July 17, 2013 -- Updated 1637 GMT (0037 HKT)
Mery Daniel couldn't wait for Marathon Monday. It was one of the things the aspiring doctor and Haitian immigrant loved most about living in Boston.
June 5, 2013 -- Updated 0227 GMT (1027 HKT)
For Erika Brannock, it was a long time coming -- 50 days in fact.
July 11, 2013 -- Updated 1818 GMT (0218 HKT)
Boston Marathon bombings suspect Dzhokhar Tsarnaev faced more than two dozen survivors of that attack as he pleaded not guilty to killing four people and wounding more than 200.
June 6, 2013 -- Updated 0152 GMT (0952 HKT)
Inside their dark, barren home in Dagestan, Zubeidat and Anzor Tsarnaev finally hear the voice they've been longing to hear for weeks.
May 23, 2013 -- Updated 1249 GMT (2049 HKT)
Deceased suspect Tamerlan Tsarnaev participated in a 2011 gruesome triple homicide outside Boston along with a Chechen killed during a confrontation with the FBI and Massachusetts State Police in Orlando, Florida.
May 16, 2013 -- Updated 1726 GMT (0126 HKT)
In the days after last month's Boston marathon bombings, the city was on edge. Residents were holed up in their homes, under strict orders not to leave.
May 17, 2013 -- Updated 1748 GMT (0148 HKT)
Boston Marathon bombing victims were collateral damage in a strike meant as payback for U.S. wars in Muslim lands, the surviving suspect wrote in a message scribbled on the boat where he was found hiding.
May 3, 2013 -- Updated 0939 GMT (1739 HKT)
What does Katherine Russell know? What might she have known, if anything, about his activities in the days and months preceding the April 15 bombings?
May 2, 2013 -- Updated 1309 GMT (2109 HKT)
After twin blasts shook Boston -- killing three and wounding more than 260 others -- investigators sprung into action looking for those responsible.
May 2, 2013 -- Updated 1440 GMT (2240 HKT)
One of the nation's foremost experts on keeping clients off death row is joining Boston Marathon bombing suspect Dzhokhar Tsarnaev's defense team.
April 28, 2013 -- Updated 1505 GMT (2305 HKT)
The black Mercedes SUV sped down Spruce Street going about 70 mph, the driver struggling to maintain control. The vehicle had a busted headlight and flat tire.
Click through our galleries of the Boston Marathon bombing, from perspectives on the attack to the suspects, as well as the manhunt and celebrations in Boston after both suspects were found.
Today's five most popular stories