By Marty Graham

SAN DIEGO, July 19 (Reuters) - A woman killed in California

this year while her husband, a U.S. Marine, was deployed in

Afghanistan was the victim of television-inspired sadomasochist

violence, search warrants filed by police and prosecutors showed

on Thursday.

A seven-page note left by one of three suspects charged in

the murder of 22-year-old Brittany Killgore led police to a "sex

dungeon" in the basement of a home in Fallbrook, a small

community adjacent to the Camp Pendleton military base north of

San Diego.

The case has received intense media coverage in the San

Diego area, home to both Camp Pendleton and a large naval base,

where public sympathy over the death of the young wife of a

deployed service member is high.

Killgore was last seen alive on April 13, just days after

she had filed for divorce, heading out on what was supposed to

be a dinner date with 45-year-old U.S. Marine Corps Staff

Sergeant Louis Perez, police said.

Thirteen minutes after Perez picked her up, Killgore sent a

text message to a friend with a single word: "HELP," according

to affidavits filed by San Diego Sheriff's Department Detective

Will Altenhof.

Several hours later, the unidentified friend received a

message in response to her frantic attempts to try to contact

Killgore saying she was enjoying a party and was fine, the

search warrant showed. The friend told deputies it contained

language Killgore never used before, and she did not believe it

was genuine.

Killgore's nude body was found four days later in a remote

area of Riverside County, north of San Diego. Police believe she

was killed in the Fallbrook home.

Her killer used power tools to try to dismember the body in

the manner she had seen on "Dexter," a television series about a

serial killer, according to a confession note left by one of the

suspects after a failed suicide attempt. That note is quoted in

one of the affidavits.

Perez and his roommates Dorothy Grace Maraglino and Jessica

Lynn Lopez have all pleaded not guilty to murder charges and are

being held on $3 million bail each.

Perez told deputies he and Killgore went to downtown San

Diego and he lost her at a club called Whiskey Girl. However,

cell phone records for Perez and Killgore indicated they were in

Fallbrook at the time, according to the search warrants.

Maraglino, 37, told deputies that she was a dominatrix,

according to the search warrants. Lopez, 25, was interested in

sadomasochism and had a collection of sex toys, according to the

affidavits.

Prosecutors, deputies and Killgore's family have stressed

that Killgore was not a willing participant in the sex games at

the Fallbrook home.

(Editing by Cynthia Johnston and Lisa Shumaker)