Lawyers for the father of a Chechen man who was fatally shot while being questioned about ties to one of the Boston marathon bombing suspects say Ibragim Todashev was recovering from a knee injury that would have made it difficult for him to attack law enforcement officers.

Todashev was killed in May while being questioned by FBI agents and police from Massachusetts and Florida at his Orlando apartment. Officials originally said Todashev lunged at an agent with a knife. They later said it was no longer clear what happened. An investigation is being led by the FBI.

The lawyers said Tuesday that they understand an FBI agent fatally shot Todashev. An FBI spokesman didn't immediately respond to an email.

At Tuesday's news conference, Abdulbaki Todashev teared up talking about his son.