The third and last teen suspect in the fatal stabbing of Barnard College student Tessa Majors has been arrested, law enforcement sources told The Post on Wednesday.

Luchiano Lewis, 14, surrendered to police with his lawyer Wednesday morning and is expected to be arraigned in Manhattan Supreme Court later Wednesday in connection with the Dec. 11 killing of the 18-year-old, the sources said.

Police have previously interviewed Lewis, but he was initially let go uncharged. He will be charged as an adult.

A search warrant had also been executed at his home.

The alleged teen knifeman, 14-year-old Rashaun Weaver, was slapped with charges of robbery and second-degree murder last week for the fatal knifing of Majors.

Weaver was indicted by a grand jury and taken into custody last week in the lobby of his home at the Taft Houses project in East Harlem. He has a court appearance later Wednesday in Manhattan.

Police have also previously busted 13-year-old Zyairr Davis in Majors’ killing.

The arrest of the third suspect comes more than two months after Majors, an aspiring journalist and musician from Charlottesville, Virginia, was repeatedly stabbed in Harlem’s Morningside Park.

Authorities and sources said Majors fought like hell against the knife-wielding teen who took her life during what has been called a botched robbery involving three middle school-age muggers.

DNA recovered from under her fingernail, as well as surveillance footage and a recording, helped police tie Weaver to her killing.

“What we can do is say that we are confident that we have the person in custody who stabbed her,” NYPD Commissioner Dermot Shea said in announcing the arrest last week.

In the key recording, Weaver is caught telling someone that Majors was “hanging onto her phone” as she struggled, according to the criminal court complaint.

“The defendant stated in substance that 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 a criminal complaint.

Davis has told cops he did not do the stabbing, but said Majors was knifed with such force that feathers flew from her down jacket, officials said.

He is being held in a Brooklyn juvenile jail on murder and robbery charges.