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ORLANDO, Fla. (AP) A Chechen immigrant shot to death in central Florida after an altercation with an FBI agent had several ties to that of one of the Boston Marathon bombing suspects who authorities were questioning him about at the time.

Ibragim Todashev's Chechen roots and mixed martial arts background mirror that of Tamerlan Tsarnaev, the Boston bombing suspect killed in a shootout with police last month. The two also had lived in the Boston area.

Todashev, a 27-year-old mixed martial arts fighter, was fatally shot by authorities early Wednesday at his Orlando home during a meeting with the agent and two Massachusetts state troopers, authorities said. The agent was taken to a hospital with injuries that were not life-threatening.

Three law enforcement officials, speaking on condition of anonymity, said Todashev had lunged at the FBI agent with a knife. However, two of those officials said later in the day it was no longer clear what had happened. The third official had not received any new information.

The FBI gave no details on why it was interested in Todashev except to say that he was being questioned as part of the Boston investigation. However, two officials briefed on the investigation said he had implicated himself as having been involved in a 2011 triple-slaying in a Boston suburb that authorities believe may have been connected to Tamerlan Tsarnaev, the 26-year-old Boston bombing suspect killed in a shootout with police days after the April 15 terrorist attack.

Public records show that Todashev resided in nearby Watertown, Mass. last year.

Tamerlan Tsarnaev's younger brother, Dzhokhar, survived the shootout with police and is now charged with carrying out the attack that killed three people and wounded more than 260 in downtown Boston. He is also charged in the slaying of an MIT police officer days later.

Several of Todashev's former roommates who were questioned by the FBI said he knew Tamerlan Tsarnaev, an aspiring boxer, from mixed martial arts fighting in Boston and that the FBI was asking about him.

"He's a regular guy, nothing wrong," Saeed Dunkaev said of Todashev.

Todashev had lived on and off with other Chechens in the Orlando suburb of Kissimmee and had moved to Orlando more recently, friends said.

Investigators have been trying to establish the scope of the plot. In addition, authorities in Massachusetts said they would investigate whether Tamerlan Tsarnaev had any connection to the unsolved 2011 deaths in the Boston suburb of Waltham, where three men were found in an apartment, their throats slit and marijuana sprinkled over their bodies. One of the victims was a boxer and a friend of Tsarnaev's.

Two officials who were briefed on the investigation said Todashev made statements, while he was being interviewed by the FBI and Massachusetts state police, implicating himself as having been involved in the 2011 Waltham slayings. Neither of the officials, one of whom had earlier told The Associated Press there was no new information on Todashev lunging at the agent, knew whether Todashev had also implicated Tamerlan Tsarnaev in the killings. The two people, a federal law enforcement official and a Massachusetts state official, spoke on condition of anonymity because they were not authorized to release details of the investigation.

Neither official was sure of the extent of Todashev's supposed involvement.

Police records suggest Todashev had a hot temper, with arrests in a road rage incident and, more recently, in a fight over a parking space.

Muslin Chapkhanov, another former roommate, said Todashev knew the older Tsarnaev brother. Todashev "was living in Boston and I think he trained with him," Chapkhanov said.

Former roommate Khusen Taramov said the FBI was asking questions about a conversation Todashev had with the older bombing suspect a month before the Boston Marathon attack.

The ex-roommate said Todashev shared the substance of his previous conversations with investigators with him and that he was completely forthcoming, saying that the conversation covered basic how's-your-life kinds of topics.

It's why he was surprised that Wednesday's interview ended the way it did.

"He told them everything," Taramov said. "He told everything he knew...I don't know why that (the shooting) happened. It's crazy."

Taramov said Todashev was afraid before Wednesday's interview as well.

"That's what he asked me before he pretty much died," Taramov said. "He asked me, 'If something happens can you go out and tell all the truth. What exactly happened.'"

Like Todashev, the Tsarnaev brothers have roots in the turbulent Russian regions of Dagestan and Chechnya, which have become recruiting grounds for Islamic extremists. Investigators have said the brothers carried out the Boston bombing in retaliation for the U.S. wars in Iraq and Afghanistan.

An FBI team was dispatched from Washington to review the shooting, standard procedure in such cases.

Todashev was arrested earlier this month on a charge of aggravated battery after getting into a fight over a parking spot with two men a father and son at an Orlando shopping mall. The son was hospitalized with a split lip and several teeth knocked out, according to a sheriff's report. Todashev claimed self-defense.

"Also by his own admission Todashev was recently a former mixed martial arts fighter," the arresting deputy said in his report. "This skill puts his fighting ability way above that of a normal person."

Todashev was released on $3,500 bail after his May 4 arrest. His attorney, Alain Rivas, didn't immediately respond to a call for comment Wednesday.

Todashev was also arrested by Boston police in 2010 after a road rage incident. Witnesses told police that he argued with two other drivers and cut them off with his vehicle. According to a police report, he yelled, "You say something about my mother, I will kill you."

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Associated Press writer Steve LeBlanc and AP Legal Affairs Writer Denise Lavoie in Boston, Pete Yost in Washington and Mike Schneider and Tony Winton in Orlando contributed to this report.