National Park Service spokeswoman Christie Vanover said Thursday that investigators traced the Oct. 18 sinking of the 65-foot vessel at a Lake Mead marina to the failure of two hoses to drain water from a rear storage compartment.
Vanover says one hose was disabled by a kink. Another wasn't properly connected.
No one was on the boat and no one was injured when the 1996 Skipperliner, named Rendezvous, sank stern-first in 45 feet of water in a slip at the Temple Bar marina.
Newton's sister-in-law, Tricia McCrone, didn't immediately respond Thursday to messages.
She had said that Newton and his wife were vacationing out of the country when the boat sank.
Take ABC13 with you!
Download our free apps for iPhone, iPad and Android devices