A preemie baby who was exposed to staph bacteria at St. Vincent's Hospital and later died was part of a set of identical twins, the boy’s parents confirmed on Sunday.

Two-week old Carson Pierce died June 13th after contracting a staph infection at St. Vincent's Hospital in Portland.

Two-week-old Carson Walker Pierce was born prematurely and was the smaller of the twin boys.

The boys were diagnosed before birth with a medical condition called Twin-Twin Transfusion Syndrome, a condition where one baby receives more nutrients than the other.

Carson died suddenly June 13th.

Background: Original story on baby's death

According to his parents, an autopsy revealed a staph infection.

"They didn't know how it happened but they said that he went quickly and wasn't in pain. Later that day we found out that it was possibly an infection" Carson's parents said in a letter emailed to KGW.

Click here to read entire letter from Carson's parents

Tests by the hospital's epidemiologist later turned up staph bacteria in the neo-natal intensive care unit.

There were 46 babies in the unit at the time. Of those babies, fourteen were identified as having the bacteria on their skin or in their nose or mouth.

The hospital said that strain of staph was slightly different from the strain found in Carson’s blood.

Carson's parents said that his identical twin Mica is doing well.