A 7-year-old boy died after he was electrocuted in his own family pool, and investigators are focusing on the pool light as the cause, police said.

Calder Sloan was swimming in his pool in the backyard of his home with a friend on Sunday afternoon when he was knocked unconscious by a powerful shock of electricity, a nanny who was watching over the kids told authorities.

When Calder and his friend jumped into the pool to race one another to the other side, Calder's friend said he felt a "tingle" and got out of the water, The Miami Herald reported, noting that Calder kept swimming directly toward the underwater pool light in the wall of the deep end.

"We know the manner of death. We have to figure out the circumstances surrounding the death," North Miami Police Maj. Neal Cuevas told The Herald.

The nanny's adult son pulled Calder out of the water and they called 911, and neighbor Fabian Pesantes performed CPR, according to ABC affiliate WPLG.

"As I was touching the water, to wipe off my mouth, I was getting zapped," Pesantes told WPLG. "As I was performing CPR on the boy I was getting zapped."

A 7-year-old boy is dead after he was electrocuted by the light in his family pool on April 16, 2014, police said. (WPLG )

The medical examiner determined the cause of death was a faulty pool light, although the investigation is still ongoing, according to The Herald.

"This was always a place of happiness and joy, and lots of activity," the boy's father, Chris Sloan told WPLG. "The world is a worse place because we're not going to get to realize the potential of what Calder Jacob Sloan was capable of."

An electrical contractor who inspected the light told The Herald that a wire was not attached correctly, sending high-voltage electricity to the pool light.

The family has opened a memorial fund at the Lehrman Community Day School where Calder attended school.