UPDATE 11:45 a.m. EST:
David Dao's lawyer Thomas Demetrio said Dao and his legal team planned to sue "after our investigative work is done."
Demetrio also "pledged" that Dao himself would publicly speak about the event at some point, but did not specify a timeline.
He added that Dao had "no interest in seeing an airplane" again after the incident.
UPDATE 11:23 a.m. EST:
Dao's lawyer Thomas Demetrio said Dao's family was "not ready to sue. We're doing our due diligence."
Demetrio also said Dao called the United experience more harrowing than fleeing Vietnam.
"There's a culture of disrespect" at airlines, including United, Demetrio said, adding that he thought CEO Oscar Munoz's apology was "staged."
BREAKING: Lawyer for passenger dragged from United flight says city of Chicago is also responsible, not just airline.— The Associated Press (@AP) April 13, 2017
He also implied the city of Chicago was partially responsible for his treatment.
UPDATE 11:17 a.m. EST:
During a press conference on Thursday, Thomas Demetrio, lawyer for David Dao, said Dao suffered a concussion and broken nose and needs reconstructive surgery as a result of being dragged off United Airlines Flight 3411.
Demetrio also said Dao's treatment wasn't "a matter of race at all" despite some Chinese observers suggesting he was singled out.
BREAKING: Lawyer says passenger dragged from United flight suffered significant concussion, broken nose and lost two front teeth.— The Associated Press (@AP) April 13, 2017
ORIGINAL STORY: A newly released video shows David Dao, the man dragged off a United Airlines flight after refusing to give up his seat, arguing with law enforcement moments before he was violently dragged away.
The video shows Dao insisting to law enforcement, "I am not going!"
Dao's family is expected to announce a lawsuit against the airline at a press conference Thursday morning. United has apologized for the incident and offered refunds to all passengers on Flight 3411.
WATCH | Here's the new video.
Here's the now-infamous video of what happened shortly afterward.
United Airlines CEO Oscar Munoz initially said Dao was "disruptive and belligerent" but later apologized for the incident, saying "It is never too late to do the right thing," United was widely criticized and saw its stock plummet.
Dao's lawyers asked a court to order the airline and Chicago aviation police to preserve evidence of the incident, The (Louisville) Courier-Journal reported.
A security officer has been placed on leave after the incident.