There’s new information in the case of a New York City man who police say refused to be cuffed or subdued and who died after being put in an apparent choke hold.

The medical examiner’s office says more studies are needed in the death of Eric Garner.

NYPD policy has banned use of the choke hold for 20 years.

Read background from FoxNews.com:

Internal affairs investigators and prosecutors announced inquiries Friday into the death of Eric Garner, who died the evening before outside a Staten Island beauty salon. Garner, 43, had a heart attack as he struggled with officers trying to arrest him on suspicion of selling untaxed cigarettes, police said. An autopsy was scheduled for Friday.

Partial video of the confrontation obtained by the New York Daily News shows an officer placing what appears to be a choke hold on the 6-foot-3, 350-pound Garner, who can be heard complaining repeatedly that he can't breathe as at least four other officers bring him down. He then apparently loses consciousness.

The video shows the officer who apparently choked Garner using his hands to push Garner's face into the sidewalk.

"It was very troubling," Mayor Bill de Blasio said at a press conference Friday, promising a thorough investigation. "I watched it the same way a family member would watch it, and it was very sad to watch."

Police Commissioner William Bratton said the officer depicted in the video appeared to have employed a choke hold, the use of which is prohibited in the NYPD patrol guide because it can be fatal.

"Now the investigation will determine — was the actions that they took appropriate to the resistance that they were experiencing," he said.

On “The Real Story” today, Lis Wiehl said the NYPD is looking at excessive force in this situation.

Watch more above.