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Isaiah Zoar Marin, 21, admitted to authorities "that he had fantasized recently about committing multiple homicides" and that the victim was "one of his intended targets." Marin confessed to killing his former high school classmate by nearly beheading him with a knife. He is charged with first-degree murder.

(police photo)

At one time, they were classmates at Stillwater High School, in Oklahoma. Now, one is dead and the other stands charged with murder for nearly beheading the victim with a knife on Wednesday.

According to NewsOK.com, Isaiah Zoar Marin, 21, has admitted to authorities "that he had fantasized recently about committing multiple homicides" and that the victim was "one of his intended targets."

Moments after the killing and still holding the bloody knife, Marin dialed 911 and said: "I murdered someone," the website reported.

Moments later, police found Marin running on State Highway 51, still carrying the weapon. He led them back to the apartment they discovered the body of Jacob Andrew Crockett, 19, of Stillwater, NewsOK.com wrote.

Full interview: Stillwater police brief media on murder investigation

The victim had been nearly beheaded, according to police.

Police say Marin confessed to killing Crockett and he has been charged with first-degree murder.

Background according to NewsOK.com: At a news conference, Stillwater police Capt. Randy Dickerson said Marin admitted to authorities "that he had fantasized recently about committing multiple homicides" and that the victim was "one of his intended targets."

"The conversation was that he had planned to do it all at one time," the police captain said.

The victim's brother, Jesse Crockett, told police Marin is a "religious zealot" and "heavy drug user," according to a court affidavit.

Dickerson was quick to point out at the news conference that the case was not related to recent cases of beheadings by Islamic extremists — including the attack in September by an Islamic convert at Vaughan Foods in Moore, Oklahoma.