We’re learning more about the older brother of the teen charged in the deadly bombing at the Boston Marathon.  There’s an Australian connection to Tamerlan Tsarnaev, and cops are looking at whether he is linked to a grisly triple-murder involving a former roommate.

In 2011, three men including Tsarnaev’s then 25-year old friend Brendan Mess were found in an apartment, their throats slit, their bodies covered with Marijuana and Cash.  Mess had been helping train Tsarnaev in his transition from boxing to mixed martial arts.  The victims’ throats were cut so badly their heads were nearly decapitated, and an investigating officer said the injuries struck him as similar to an al Qaida training video.

In 2009, he was accused of domestic violence by a girlfriend.  Criminal charges weren't filed, but there is some speculation that this episode spiked his attempt to gain US citizenship.

Witnesses are now coming forward to say that over the months preceding the bombing, Tamerlane Tsarnaev grew increasingly confrontational. 

He was ejected from the Islamic Society of Boston Cultural Center three months ago for repeatedly interrupting to disagree with a sermon in which the Imam said that the late civil rights leader Rev. Dr. Martin Luther King, Jr. is a fine man for Muslims to emulate.

An earlier incident had him interrupting a speaker who said it was okay for Muslims to eat Thanksgiving Turkey, and annual autumn tradition in the United States.

Tamerlan’s YouTube channel featured a video by the radical Australian cleric Feiz Mohammad, who was born in Sydney and still lives there today.  In the video, Mohammed urges Muslims to offer up their children "as soldiers defending Islam".

Like Tamerlan, Mohammed is a former boxer.  He's on the radar of ASIO and many other international intelligence agencies.

26-year-old Tamerlan Tsarnaev was killed in a police shooting a day before cops took his 19-year old brother into custody.  Dzhokhar Tsarnaev is recovering from gunshot wounds to the head, neck, arm and leg.