MURRIETA, Calif. -

The defense is expected to rest Monday in the trial of an off-duty Riverside County sheriff's deputy accused of gunning down an unarmed patron at a Murrieta bar during an argument.

   Dayle William Long could face 50 years to life in prison if convicted of first-degree murder and sentence-enhancing gun and great bodily injury allegations in the Dec. 21, 2011, shooting of 36-year-old Samuel Vanettes of Winchester.

   The trial got underway Nov. 13. Long has been on the witness stand since last Monday. 

   The ex-lawman, who remains held in lieu of $1 million bail at the Southwest Detention Center in Murrieta, has testified that he fired in self-defense, believing his life was in imminent danger. 

   According to a trial brief filed by the prosecution, at least 11 people witnessed Long shoot Vanettes at point-blank range inside Spelly's Bar & Grill at 40675 Murrieta Hot Springs Road. The victim had gone there with his sister and several friends to socialize on the night of his death, prosecutors said. 

   The brief states that Long had joined a retired colleague for drinks at  the pub several hours before the attack. During the evening, Vanettes approached the defendant and asked if he would like to join in a game of team darts because the victim's group was a person short. 

   Long's colleague left, and the off-duty lawman joined the group, continuing to drink beer and hard liquor, prosecutors allege. 

   Shortly before 8 p.m., Long and Vanettes became embroiled in a seemingly  insignificant argument about whether a certain street was located in Orange  County. Vanettes's friend, Danny Burnside, told investigators that the defendant became belligerent and invited Vanettes to ``go outside'' and fight. 

   Long allegedly stood up, removed a compact .45-caliber handgun from his  waistband and leveled it at Vanettes and his friends, then sat back down, according to court papers. 

   The 44-year-old defendant has denied pulling his gun until the actual shooting. 

   Vanettes's friend, Chris Hull, stepped in front of the defendant and shouted an expletive, gesticulating as if he was prepared to fight him, a bar  patron told detectives. 

   All witnesses acknowledged that Long began backing away from the table where Vanettes and the group were seated and that Vanettes approached Long in an attempt to defuse the situation. 

   No punches were thrown, though the bartender said there was some  shoving, and while several witnesses described Long as appearing ``upset,'' most witnesses said he was acting ``calm'' as he backed toward the bar exit,  according to the brief. 

   The prosecution alleges that Long pulled his .45 a second time, leveling  it at Vanettes from at least five feet away and firing six times, including once after the victim had fallen to the ground. Long testified that Vanettes  attempted to grab his pistol and take it from him. 

   Vanettes was hit by four bullets -- in the chest, shoulder, abdomen and cheek, according to an autopsy. He died at the scene.

   According to the brief, Long was waiting outside the establishment when  Murrieta police officers arrived and surrendered. The 10-year law enforcement  veteran initially refused to submit to a blood test to determine his level of  intoxication -- four hours after the shooting -- but was told that he had to comply pursuant to sheriff's department policy. The test showed he was right at  .08 percent blood-alcohol content, prosecutors said.   

   Long last worked as a bailiff at one of the three downtown Riverside courthouses. The sheriff's department fired him in March 2012.