A “highly intoxicated” man dressed as Santa Claus shot four people, one fatally, at a Halloween party he was hosting in Texas after he was told to call it a night, police said.

Randall Gaston Jones, 32, was arrested at a neighbor’s home after the violence erupted inside his Avenue F home in Austin — where cops found the victims bleeding from gunshot wounds shortly after 6 a.m. Sunday, authorities said.

Austin police Lt. Jason Staniszewski said just prior to the bloodshed, the partygoers told a “highly intoxicated” Jones to either go to bed or calm down before he returned from his room with a gun and confronted the crowd.

He fired one round into the floor, scattering most people at the party or prompting them to take cover. One man, identified by police as Michael McCloskey, 37, tried to intervene and was shot several times by Jones, Staniszewski said.

McCloskey died from his wounds hours later. Three other people were shot, including one victim who refused medical treatment at the scene. One victim remained in critical condition as of Monday, while another had since been released, police said.

Earlier Monday, Austin police Detective Lee Knouse told the Dallas Morning News that Jones knew all the victims.

“This was not a random act of violence,” Knouse told the newspaper.

Jones remains in custody at the Travis County Jail on three counts of aggravated assault with a deadly weapon, according to jail records cited by the Austin American-Statesman.

Jones, who has made no statements to investigators, will be charged with murder later Monday, Staniszewski told The Post. Detectives believe alcohol fueled the spat leading to the deadly shooting and were not aware of any prior beefs between Jones and the victims.