Rahm Emanuel
Rahm Emanuel was with his family in Cuba.
'Mayor Emanuel is morally corrupt!'
The Chicago mayor said "nothing can excuse" the teen's death.
WHAT'S HAPPENING
Investigators will likely focus on accountability systems that don't hold police accountable.
Philip Coleman died in police custody in 2012. Thanks to just-released video, officials are now promising to reopen the case.
The Chicago mayor took "responsibility for what happened."
Lawyers for Ronald Johnson's family say the video is similar to the footage of Laquan McDonald's killing.