The young son of Randall Cunningham, the 2 1/2-year-old Christian, was found floating in the backyard hot tub.
A woman at Cunningham's house was with several children when she found the boy at about 4:30 p.m., Las Vegas police Lt. Dennis Flynn said.
Abuse and neglect detectives were investigating the incident at the house.
Police said the drowning appeared to be an accident.
Son Of Randall Cunningham Drowns In Hot Tub