Robinson was shot several times through his hands, the news station reported.
At a news conference Friday, Davis held up graphic crime scene photos showing Robinson’s shot up hands and questioned whether he would have been able to hold a gun much less fire.
They are planning their own action on the one year anniversary of the man's death.
The GBI initially investigated the deadly use of force and turned its findings over to the Fulton County District Attorney’s Office. But the district attorney, in a statement, said the office is still waiting on more information from the federal agency before it can move forward with its investigation and make a decision in the case on any possible charges.
“The federal marshal service has not complied with their request to turn over information, to make their officers available to be interviewed,” Davis told the news station. “So, without that, the investigation is incomplete.”
The U.S. Marshal's Northern District of Georgia office told Channel 2 that it fully cooperated with the GBI's investigation, including making the officers involved available for interviews. But it referred reporters to its home office in the District of Columbia for information concerning any legal questions about what further information prosecutors still require.
Family members said their next step will be to contact elected leaders in the U.S. Congress to get a resolution.