Actor David Carradine

Actor David Carradine (Getty Images)

LOS ANGELES -- Hundreds of people, including friends, family and former co-stars, attended a funeral service for actor David Carradine Saturday.

The service was held indoors at the Hall of Liberty at Forest Lawn Hollywood Hills, the cemetery adjacent to Griffith Park. The service was invitation only, and security guards stood outside the hall.

The funeral, attended by more than 400 people, lasted for more than two hours. Among the guests were numerous actors, including Michael Madsen, Jane Seymour, Tom Selleck, Frances Fisher, Daryl Hannah, Lucy Liu, Ali Larter, Edward James Olmos, Rob Schneider and James Cromwell.

Madsen and Liu both starred alongside Carradine in the "Kill Bill" movies.

Carradine's family avoided the small group of reporters that gathered outside.

His burial was private.

Last week, Carradine, 72, was found hanging in a Bangkok hotel room. The investigation into his death is ongoing.

An independent forensics expert who examined David Carradine's body said the actor didn't commit suicide, and Carradine's brothers are asking for understanding as Thai authorities investigate.

Keith and Robert Carradine say they're grateful for the outpouring of support during what they call a "profoundly painful time."

In a statement read Thursday in Los Angeles, they also thanked U.S. and Thai authorities for their work.

The family also released a statement from Dr. Michael Baden, who said Carradine's death wasn't a suicide. He said further information from Thailand is needed for a finaldetermination.

Carradine's naked body was discovered last Thursday hanging in the closet in his luxury suite at Bangkok's Swissotel Nai Lert Park Hotel.

Police initially suspected his death was a suicide, but have since said it may have been accidental suffocation or heart failure after revealing he was found with a rope tied around his wrist, neck and genitals.

The circumstances suggested he might has died as a result of a dangerous sex game, Pornthip Rojanasunand, a prominent Thai forensic pathologist, said last week.

With the uncertainty and conflicting information surrounding the death, Carradine's family in the U.S. went to the FBI last Friday asking for its help investigating the case.

"If the FBI wants to get involved, we will do our best to cooperate," Thai police Maj. Gen. Amnuay Nimmano told reporters, adding that it would have to be in an observer role as mandated by Thai law. "We have nothing to hide."

Sirisak Tiyapan, director-general for International Affairs of Thailand's Attorney General's Office -- which would handle any cooperation with U.S. law enforcement agencies -- said his agency had not yet received a request from the FBI to assist in the Carradine case.

U.S. Embassy Spokesman Michael Turner said he couldn't comment on the investigation but did acknowledge that FBI agents attached to the embassy were talking informally about the case with their Thai police counterparts.

FBI spokeswoman Laura Eimiller said earlier that the agency generally only gets involved in death investigations overseas if a crime is suspected.

After numerous leaks about the crime scene and cause of death, Maj. Gen. Amnuay at Monday's press conference sought to quash further speculation. He refused to comment on the condition Carradine's body was found in or the reports that he died from the dangerous form of sex play known as auto-erotic asphyxiation.

"The previous conclusions on the cause of death were made by people who know nothing about the case," Amnuay told reporters, adding that he had to protect the privacy of Carradine's family.

Carradine flew to Thailand at the end of May and began work on a film titled "Stretch" two days before his death. His friends and associates told CNN's Larry King he had a happy marriage, had recently bought a new car, and had several films lined up after he finished work in Bangkok.

A martial arts practitioner himself, Carradine was best known for the U.S. TV series "Kung Fu," which aired from 1972-75. He played Kwai Chang Caine, an orphan who was raised by Shaolin monks and fled China for the American West after killing the emperor's nephew in retaliation for the murder of his kung fu master.

Carradine also appeared in more than 100 feature films with such directors as Martin Scorsese, Ingmar Bergman and Hal Ashby. He returned to the top in recent years as the title character in Quentin Tarantino's two-part saga "Kill Bill."