The NYPD arrested the third and final suspect in the killing of 18-year-old Barnard College student Tessa Majors on Wednesday.

Luchiano Lewis, 14, took part in a "sustained attack" on Majors, Matthew Bogdanos, Assistant District Attorney, said in court on Wednesday. "This isn’t a spur of the moment, few second attack."

Lewis surrendered to police Wednesday morning and was ordered held without bail by Acting State Supreme Court Justice Gayle Roberts. He was escorted in handcuffs into the courtroom by two NYPD detectives. He wore a black and grey camouflage jacket and sat silently in the gallery's front row until his case was called.

Lewis was arraigned with another 14-year-old, Rashaun Weaver, who was arrested on Saturday for the fatal December 11 stabbing of Majors in Morningside Park. Weaver was also ordered held without bail, at a Saturday court appearance. His lawyer did not ask Justice Roberts to reconsider that decision on Wednesday and he was again remanded without bail.

“Weaver is the stabber. Not Luchiano Lewis. Luchiano Lewis is one of the individuals that prevented her escape," Bogdanos said.

Inman Majors, Tessa's father, was in court for the arraignment. He declined to answer reporters' questions as he left the courthouse.

Lewis's court-appointed lawyer, Alexis Padilla, said his client voluntarily surrendered to police and that this was his client’s “first brush with the law.” Lewis “isn’t going anywhere. He’s coming back to court," Padilla said.

The two 14-year-olds are being charged as adults, and face murder charges and five counts of robbery, each. One murder charge against Weaver alleges he killed Majors intentionally, another alleges Weaver and Lewis committed “felony murder” by killing her during a robbery gone wrong, according to the indictment against them. They both face maximum sentences of 9 years-to-life, Bogdanos said.

A third suspect, a 13-year-old, was arrested on December 13th. Because New York law draws the line in most murder cases between reform-oriented juvenile "adjudication" and adult criminal punishments at 14, the 13-year-old was charged as a juvenile and is being prosecuted in Family Court. He is also being held without bail.

Majors’s death stunned New York City, whose residents have grown used to record-law crime rates and a dearth of front-page murders. It also raised questions about whether officials from Barnard—and its sister school Columbia University—did enough to inform students about a spike in knifepoint robberies in Morningside Park, and spotlighted racial tensions between Columbia and the surrounding community.

The three teens were allegedly hunting for victims in the park the night she was killed.

They entered the park "almost the same time as Ms. Majors," following what ADA Bogdanos called "intended victim one." After being interrupted while surrounding another potential victim on the steps inside the park at 116th Street, they "went down the stairs where they literally crossed paths” with Majors, Bogdanos said.

That's when a witness heard Weaver say “run your shit. Give me your phone. Got some weed, give me that too," according to Bogdanos.

Majors tried to escape, but Lewis—the suspect arrested on Wednesday—"prevented her from escaping by placing her in a bear hug or headlock," Bogdanos claimed.

A struggle ensued. Security camera video shows "three individuals and Tessa Majors appearing to struggle on that landing, before Ms. Majors was able to break free and slowly stagger up the stairs," according to the complaint against Weaver.

Weaver allegedly stabbed Majors four times. "One penetrated 4 inches into her heart," Bogdanos said. The knife pierced the “right ventricle of her heart. She had less than 5 minutes to live. She struggled up the stairs.”

NYPD officer Ena Lewis responded to a robbery-in-progress call and found Majors lying face down in the street in front of Columbia President Lee Bollinger's official residence.

"I turned her over," Lewis testified at a December court hearing for the 13-year-old, and "observed blood on the female’s face and her wheezing as if she was trying to catch her breath."

Majors was declared dead at the hospital.

Tessa Majors's father Inman Majors (right) was present for the arraignment of two suspects charged in Majors's death.

Weaver admitted "he was in the park and tried to take the girl’s phone and 'she was hanging onto her phone' and that he hit her with a knife," according to the complaint against him. The admission is allegedly documented in an audio recording.

Weaver allegedly evaded police after Majors's killing, leading NYPD Chief of Detectives Rodney Harrison to tweet his photograph and ask for "assistance from the public in locating this individual regarding the recent homicide in Morningside Park." He was found the day after Christmas, after hiding out in "numerous locations, one of them was in the Bronx," Chief Harrison said at Saturday's news conference.

Police took a sample of Weaver's DNA and released him pending results of testing and further investigation. He remained at large until last Friday night. That's when he was re-arrested in the lobby of the Taft public housing building where he lived with his mother and other family, NYPD Commissioner Dermot Shea said at a news conference at police headquarters on Saturday.

ADA Bogdanos said the arrests of Lewis and Weaver were the result of a “careful, methodical, comprehensive and thorough investigation." More than “four dozen witnesses and more than 100 exhibits” were presented to the grand jury.

"This was no rush to judgment," Bogdanos emphasized.

Weaver's DNA was found under one of Majors’s fingernail clippings, police alleged in the complaint against him. Other evidence in the case includes "video evidence, blood evidence, smart phone evidence, iCloud evidence, the witness identification, and the defendant's own statements," Manhattan District Attorney Vance said at Saturday's news conference.

Weaver's prosecution presents the first high-profile test of New York's newly-created "Youth Court." In Youth Court, all violent juvenile offenders are treated as adults for sentencing purposes, but the court will be directed to consider the defendant’s age when imposing a sentence.

"While a criminal process will never fully heal the unimaginable pain suffered by Tessa Majors’ family and friends, this indictment is a significant step forward on the path to justice," Vance said in a news release on Wednesday. "This is how we will achieve true justice for Tessa and her loved ones.”

Weaver and Lewis's next court appearance is scheduled for April 7th.