LAS VEGAS -- Boxer Johnny Tapia remained in critical condition at a Las Vegas hospital on Sunday.

Tapia, 35, had been hospitalized since early Saturday morning when he fell down in his home and lost consciousness, his publicist Trayce Zimmerman said.

The hospital would not provide details on Tapia's medical situation, but Zimmerman said he was being treated for head trauma and was on a respirator.

Tapia was hospitalized hours after he and his cousin were involved in a police standoff at a home near Bullhead City, Ariz.

The situation ended Friday night with the arrest of two men. Tapia was not arrested, but was served with a summons to court on a felony charge of possession of drug paraphernalia.

Tapia had returned home after the incident and seemed depressed before he collapsed, Zimmerman said. He was given a citation for possession of drug paraphernalia. Bullhead City is about 90 miles from Las Vegas.

Zimmerman said Tapia was with his wife, Teresa, when he fell.

"She said he felt depressed and then he just fell down and lost consciousness,'' Zimmerman said.

Zimmerman said Teresa Tapia called 911 and her husband was taken to the hospital.

Tapia, who only two years ago was hospitalized for a drug overdose after attempting suicide, last fought Nov. 3 when he lost a 12-round decision to bantamweight Marco Antonio Barrera.

Before the fight, he freely admitted to a turbulent past that led him to fight in trunks with the slogan "Mi Vida Loca,'' or My Crazy Life, emblazoned on them.

As a child, Tapia saw his mother stabbed to death. He was suspended from boxing for three years for cocaine addiction, and nearly died three times from drug overdoses in the early 1990s.

"It's there every day,'' Tapia said before he fought Barrera. "I've got a lot of problems. I can mess up tonight or tomorrow. It's always there.''

In the standoff with police, detectives went to a home in Golden Valley, Ariz., after getting a tip that Tapia's cousin was there, said Mohave County Sheriff's Office spokesman Jarrod Lyman.

The cousin, 31-year-old Raymond Whiting, was wanted on a warrant for failing to appear on aggravated assault and weapons charges in New Mexico, Lyman said.

Whiting is suspected of trying to slash a woman's throat during a carjacking in Albuquerque last April.

Police said the standoff started when the men refused to leave the home.

After about an hour, police forced open a door to the home and used a public-address system to ask Whiting to come out, Lyman said.

"Fortunately, the situation resolved itself,'' he said.

Whiting was taken into custody. Another man, Walter Joseph Michael Beck, 26, was arrested on a cocaine possession charge. Lyman said Tapia was not arrested but was to be summoned to court on a felony charge of possession of drug paraphernalia.

"He was very cooperative with the detectives,'' Lyman said of Tapia.

Tapia and his cousin have been in legal trouble before. In 1992, Tapia was arrested on charges that he intimidated a witness to a murder committed by Whiting.

Whiting later pleaded guilty, while Tapia was acquitted of the charge against him.

In July 1994, Tapia was charged with attempting to sell imitation crack cocaine to an off-duty police officer. He was acquitted.