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 said 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. He was 27.

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.

At a press conference in Tampa on Tuesday, lawyers said that they understand an FBI agent fatally shot Todashev. An FBI spokesman didn't immediately respond to an email.

Abdulbaki Todashev teared up as he spoke about his son. He said he his son was a "good boy" who "wanted to live".

Bobbie O'Brien is a reporter for WUSF in Florida.