Fire Commissioner Lloyd Ayers says an overused cord sparked Tuesday's fire that killed 3-year-old Nicholas Budzilo.
Budzilo died of smoke inhalation on Wednesday, a day after rescuers pulled him and his 5-year-old brother from the flames.
Budzilo's mother and his 1-year-old brother escaped the burning house. His grandfather was hospitalized for burns after trying to rescue the boys who were trapped on the second floor.
Christopher and Jake Budzilo remain hospitalized. Their mother was released from a hospital on Wednesday but their grandfather is still in critical condition.
