The two drug-addled women found wandering the halls of the Hotel Pennsylvania holding an unresponsive baby — who later died — have been released by police, authorities said Sunday.

Roneisha Collier, 24, and her 26-year-old fiance, Kiara Watson, were released from custody without charges late Saturday at the behest of the Manhattan District Attorney’s Office, the NYPD said.

The couple — whom police sources said are heroin addicts — were initially arrested after they were spotted trying to feed unresponsive 4-month-old Dominic Greene in the Midtown hotel early Saturday.

Collier claimed that the tot was her stepbrother, authorities said.

The women, who are Delaware residents, were carrying about $7,000 in cash and were not guests of the hotel.

The city medical examiner is working to determine how the baby died.