A Blaine man who told authorities he feared his son because he was under the influence of an illicit drug was charged with second-degree murder Monday after he shot and killed him in their home.

"I kept shooting until I couldn't shoot anymore," Joseph T. Effertz, 61, told police after he was arrested Friday.

Effertz was charged in Anoka County District Court with second-degree murder in the death of his 38-year-old son, Joshua J. Effertz.

The younger Effertz died of multiple gunshot wounds, the Hennepin County medical examiner's office said.

According to the complaint, the father called police about 7 a.m. Friday to report the shooting at a house in the 3200 block of 89th Curve NE.

When officers arrived, they found the son in the middle of the road in front of the home. He had "a large amount of blood on his clothing and body," according to the complaint.

Joshua Effertz was taken to Hennepin County Medical Center, where he died at 8:08 a.m.

The father told police that his son came into his room looking for a videotape and he thought that his son was under the influence of a controlled substance. The father said he was afraid of his son, but "denied that [his son] had acted aggressively toward him that morning," according to the complaint.

The older Effertz was on his bed with a gun nearby, while his son had his back toward his father. When the son turned to his father, he "saw the gun and began leaving the bedroom," according to the criminal complaint.

That's when the father started shooting. The son suffered three to four gunshot wounds to the lower back, right thigh and biceps and left forearm, according to the criminal complaint. "The gunshots appeared to have entered from the back," according to the criminal complaint.

The older Effertz was arrested without incident and is being held at the Anoka County jail.

Judge Bethany Fountain Lindberg set bail at $750,000.

"This is a situation where family dynamics resulted in a horrible tragedy," Anoka County Attorney Tony Palumbo said in a news release.

Effertz's next court date is Aug. 22.

Twitter: @KarenAnelZamora