Olivia Gee, 2, and Micha Gee, 3, died within minutes of each others. View Full Caption Facebook

THE BRONX — The Kingsbridge Heights siblings that died within minutes of each other Monday night were beaten to death, the Office of the Chief Medical Examiner reported Tuesday.

Police originally believed that Olivia Gee, 2, and Micha Gee, 3, who both suffered from asthma had died from complications caused by the respiratory affliction, but bruising was later found on both children, according to authorities.

Their mother's boyfriend, who lived with the family in their Van Cortlandt Park South home, told police he discovered the two struggling for breath in their crib at 1:30 a.m. They were taken to Montefiore Medical Center where they were pronounced dead within minutes of each other.

An autopsy report by the OCME concluded that both children died from blunt force trauma in what the office ruled as a homicide.

Both the mother and the boyfriend were questioned by police, but no arrests have been made.

Mayor Bill de Blasio said that the NYPD and the Administration of Children's Services will continue to investigate the toddlers' deaths.

“Our city is mourning the loss of two young children in a tragedy Monday in the Bronx. As a parent, it’s very painful for me to think about the death of these two children and what the family is going through right now," he said.