This is an archived article and the information in the article may be outdated. Please look at the time stamp on the story to see when it was last updated.

SAN DIEGO — A defense attorney said Tuesday her mentally ill client had “no choice” but to kill his younger sibling because he saw him as a “demon.”

Deputy District Attorney Jessica Coto told a jury that Jason Paris planned to kill Cedric Paris — 15 months his junior — because everybody in the family was out to get him.

Coto said the defendant bought a .45-caliber semiautomatic handgun in September 2014 and went to a gun range twice to shoot at human targets before driving to Allied Gardens the night of Jan. 17, 2015, to kill the 42-year-old victim.

He told his roommate’s daughter, “I’ve got some business to take care of,” then drove around his brother’s neighborhood for hours before knocking on his front door about 9:45 p.m., the prosecutor told the jury.

The defendant asked his brother to come outside, shot him four times at close range after retrieving his gun from his SUV, then drove off, the prosecutor alleged.

The victim’s wife called 911 after finding her husband’s body in the front yard.

The defendant was pulled over on northbound Interstate 15 near Scripps Ranch and arrested. At police headquarters, he told detectives that he became upset when his younger brother — who he thought was supposed to look after him — became involved with his future wife, Janeth, Coto said.

The brothers’ mother described her sons’ story like the Bible story of Cain and Abel, in which Abel found favor with his parents — Adam and Eve — and Cain became jealous and killed Abel, according to the prosecutor.

Coto urged jurors to find the defendant guilty of first-degree murder and personal use of a firearm, with a special circumstance allegation of lying in wait.

Once the guilt phase is completed, the jury would be asked to decide if the defendant was insane at the time of the killing. He faces life in prison without parole if convicted and found sane.

Deputy Public Defender Whitney Antrim told jurors that her client — who was diagnosed in 1994 with a form of schizophrenia — believed his brother was a demon and, in his mind, had “no choice” but to kill him.

When he was off his medications, he had the “deranged and delusional” belief that his brother was a demonic figure and that there was “no other way out” but to kill him, the defense attorney said.

“It was God’s will,” Antrim said of her client’s thinking.

Janeth Paris said she and her husband hadn’t seen the defendant in two years when he showed up at their home that night.