Officers arrived on West 156th Street on Sunday afternoon, where they found the 27-year-old unconscious and unresponsive.
Hickerson was with the actress at the time of her death, according to police.
Actress Hayden Panettiere was found in cardiac arrest prior to her death on Sunday, the Greenville County Coroner's Office said.
Panettiere, 36, died Sunday at a residence in Greenville, South Carolina.
He had swollen ankles, bruising around his wrists and ankles and protruding ribs when officers responded to a 911 call Tuesday morning.