The death toll in last month’s tragic Bronx apartment fire climbed to 13, police said Thursday.

Francis Holt, 27, was taken off life support, adding one more fatality to the deadliest New York fire in more than a quarter century, cops said.

The Dec. 28 blaze, which gutted 2363 Prospect Ave., was started by a 3-year-old boy playing with burners on the family stove, fire investigators have said.

The boy’s mom grabbed her two kids and dashed out the door, leaving it open and allowing flames to shoot up the building stairwell, authorities have said.