A Princess Cruises passenger is facing charges that he killed his wife while on a Princess Cruises vessel off Alaska.

Documents filed with a US federal court show that Utah Kenneth Manzanares is accused of killing his wife Kristy while the the pair was in their cabin on the 3,110-berth Emerald Princess (built 2007).

Federal Bureau of Investigation special agent Michael Watson told the court that company security officer Peter Brust, of Carnival Corp's Holland America Group, informed the agency of the alleged crime.

He told agents that the Bermuda-flagged ship's security and medical personnel responded to an incident in the Manzanares' room to find Kristy dead with a severe head wound and blood spread about the room.

Kenneth allegedly had blood on his hands and clothing.

Court documents show that when asked by a security security staff member what happened, Kenneth said: "She would not stop laughing at me." 

Ship staff restrained Manzanares after he began to drag her body toward the balcony and than back into the cabin again.

The vessel was in US territorial waters off Alaska's Forrester Island at the time of the incident, according to the FBI.