Bellevue police say the arrest is in connection with the shooting death of 18-year-old Kyle Williams. The victim died of a single shot to the head on March 3.
Investigators say Williams' body was discovered in his bedroom, by his grandfather.
Armendariz was arrested at a home in northeast Omaha March 11 by members of the Metro Area Fugitive Task Force. He had allegedly been on the run since February after missing a court date in Douglas County on a theft charge.
He's now charged with first-degree murder and use of a weapon to commit a felony. "It's the most serious crime that we have. You're talking about a crime that's planned and premeditated," said Chief Deputy Sarpy County Attorney Tricia Freeman.
At his Sarpy County arraignment Monday afternoon, Armendariz was denied bond. He was polite to Judge Todd Hutton, calling him "Sir," and saying, "please." Armendariz even apologized for his signature on a document being sloppy due to the handcuffs he was wearing.
But he has a previous history with the law, including an adult charge of marijuana possession, between an ounce and a pound, as well as a number of juvenile charges ranging from shoplifting to burglary.
The suspect's age, Freeman said, is particularly troubling in regards to the latest allegation. "We're dealing with a young man who, worst-case scenario is convicted, has determined the rest of his life at 17," she said. "And how much do you know at 17? And are you prepared to make those types of decisions?"
The family of the 18-year-old victim has already had to cope with another loss of sorts. Kyle Williams' younger brother Cameron, was sentenced last year for his role in two shootings, including one where he took aim at Omaha police. He was only 15 at the time, and he could be nearly 60 years old by the time he's released.
"We've seen so many youthful offenders," Freeman said.
In court, she told the judge that Armendariz had run away from home in February, afraid of being sent to the youth detention facility in Kearney.