Medical examiner’s office ruled death a homicide, caused by neck compression.
Late Wednesday, police released video surveillance of a man they said they wanted to question in the woman’s death.
Police said a passer-by rummaging through the trash outside the building found the suitcase and called 911. Police responded minutes after 12 midnight.
Police Commissioner Raymond Kelly said the unidentified woman was in her 20s or 30s and appeared to have a head injury. She was dressed.