NEW YORK (PIX11) -- After a Staten Island man died while getting arrested, Mayor Bill de Blasio and Police Commissioner Bill Bratton have vowed for a thorough investigation.

The video of the arrest, showing Eric Garner saying he couldn't breath as officers wrestled to the ground, is sure to be the center of the investigation.

Former NYPD Deputy Inspector Corey Pegues examined the video and discussed if the officers followed proper protocol.