As family members and friends prepare for the first anniversary of 15-year-old Lawrence “Larry” King's death on Valentine's Day, new details about his killer have emerged.

In a newly filed brief, prosecutors contend that King's death at the hands of Brandon McInerney, 14 at the time, was calculated murder.

McInerney killed King, who told friends and family he was gay and often wore makeup, on February 12, 2008 with two shots in the head during his 8th grade English class at E.O. Green Junior High School in Oxnard, California. He survived the night, but died on Valentine's Day after being pronounced brain-dead.

The brief is a response to the accusation by defense attorney Scott Wippert that Ventura County District Attorney Gregory Totten abused his office when he decided to try his client as an adult.

The prosecutor's brief, details of which were published this week in the Ventura County Star, paints McInerney as an executioner.

“It was an absolutely brutal crime, with premeditation and deliberation,” Deputy District Attorney Maeve Fox wrote. “He was familiar with firearms and had fired that gun before. He knew what he was doing.”

McInerney was aggressive towards King, teasing the effeminate boy for weeks, and once vowed to “get a gun and shoot” him, the documents show.

A July Newsweek cover story focused heavily on King's effeminate behavior. The story reported that he liked to tease other boys – he would say “I know you want me” in the hallways – and had asked McInerney to be his Valentine in front of his teammates, who naturally teased him about it.

Gay rights groups decried Newsweek for the suggestion that somehow the murder was justified.

Memorials and a candlelight march and vigil are being organized by local gay rights groups to mark the first-anniversary of the shooting.

A resolution read in Congress Thursday honored King's life.

“Every child should be guaranteed an education free from bullying, harassment, discrimination and violence,” Rep. Lois Capps (D-Calif.), who introduced the resolution, said on the House floor.

The prosecution brief also detailed for the first time that investigators had found a training video in McInerney's possession titled “Shooting in Realistic Environments” and various neo-Nazi books.