it's not something that i could make over a few hours. i have been thinking about this since the day i was sworn in as police commissioner. >> reporter: an internal nypd investigation found grave misconduct by the officer, that report which factored in the commissioner's commission, characterized his use of force as reckless and a gross deviation from the standard of conduct. a federal investigation and grand jury proceedings began against him in 2014. no charges were filed in either case. tonight, garner's family is praising the nypd's decision but says this isn't the end. >> i thank you for doing the right thing. i truly and sincerely thank you for firing the officer. regardless or however you came up to your decision. you finally made a decision that should have been made five years ago. we will be going for the congressional hearings. we will be trying to reopen the case. we will be going after the rest of the officers involved,