SAN DIEGO -- A man accused of sexually assaulting and killing an intoxicated man in San Diego and drugging and sexually assaulting another young man must stand trial on murder and other charges, a judge ruled Friday.

Philong Huynh, 39, of City Heights, is accused of killing 23-year-old Dane Williams of Huntington Beach, on Jan. 26, 2008.

The charges include murder and a special circumstance of murder during sodomy or oral copulation.

Williams, who had come to San Diego to work at a convention for a Costa Mesa-based skate and surfwear clothing company, disappeared after leaving the Hard Rock Cafe in the Gaslamp Quarter. He was intoxicated and seen falling to the ground when he left the club, prosecutors said.

His body was found three days later in an alley a block from where Huynh lived.

A cause of death was undetermined, but his underwear was missing and DNA evidence was taken from clothing items and his body, said Deputy District Attorney Gretchen Means.

The defendant is also charged with sodomizing a second intoxicated young man who came forward last year. DNA evidence from that man allegedly tied Huynh to Williams' murder.

Huynh could face the death penalty or life in prison without parole if convicted. District Attorney Bonnie Dumanis will decide later which penalty the defendant might face if he's found guilty.

After a four-day preliminary hearing, Judge Charles Rogers ruled Friday that enough evidence had been presented for Huynh to stand trial, and a Superior Court arraignment was set for March 18.

Billy Sharrock, the former co-owner of a company that produced amateur gay porn, testified Wednesday that he hired Huynh in August 2006 to take care of the firm's computers.

He said Huynh told him that he liked to show young men a good time, then offer them something to "relax" and "have his way" with them.

He testified that Huynh said he liked straight guys because they were "more of a challenge."

"He told me he would offer a drug to them ... the majority of them took it," Sharrock said.

He said he saw Huynh with Valium at the office, and that the defendant told him he had a medical background and got his drugs in Mexico.

Sharrock said Huynh told him that "these boys were unconscious when he was having anal sex with them. That was his form of entertainment."

The witness said Huynh told him he liked intoxicated men and young men in the military.

"He told me he would provide them with alcohol and hopefully he would have sex," Sharrock testified.

The second alleged sexual assault victim, a Navy sailor who has not been publicly identified, testified in December that he met the defendant in downtown San Diego last June 6 and that Huynh offered him a ride to the beach.

He said that on the way, Huynh stopped at a liquor store and bought two bottles of liquor and two bottles of Coke.

He said that after going to Ocean Beach, he had a headache and Huynh gave him a pill or two from a Tylenol bottle, after which he blacked out.

He said he has only scattered memories of the rest of the evening, but that the next morning, he woke up at the defendant's home with his underwear off.

He denied being gay and said an officer later recommended he get a sexual assault exam.

Prosecutors said doctors found he had benzodiazepine intoxication and visible signs of a sexual assault consistent with sodomy.

Benzodiazepine is a central nervous system depressant and an ingredient in such drugs as Valium, Xanax, Librium and Ativan, along with Rohypnol, which is widely known as a "date rape drug."

Pharmaceuticals were later found in the defendant's home, including a prescription for benzodiazepine that was filled in January 2008, the month Williams was killed, according to prosecutors.