Tessa Majors was stabbed on her way into Morningside Park on Manhattan's Upper West Side on Friday

A second suspect has been arrested for the murder of Tessa Majors, a Barnard College freshman who was stabbed on Wednesday in a mugging in an Upper Manhattan park.

No information about the second suspect has been released aside from the fact he was arrested on Friday, something that was reported by The Daily Beast.

He was taken into custody on Thursday on weapons and trespassing charges after being found in a building where he did not live, police sources say, but was later charged with felony murder.

He is not being named because he is being tried as a juvenile.

On Friday, he appeared in court to face the charges.

According to police sources, the 13-year-old was arrested on Thursday in an apartment where he was trespassing.

When he was taken into custody, he started talking about the murder and told detectives that he and his middle school friends decided to go mugging after school on Wednesday.

They first encountered a man but did not attack him.

When Tessa was coming down the steps of the park alone, they went for her and demanded money, her phone and her purse.

She put up a fight and they stabbed her. The boy said it was his two friends who did the stabbing.

It remains unconfirmed if a third suspect is in custody being questioned or not.

There have been conflicting reports about what time Tessa died, how many people were involved and how many people have been questioned over it since the incident and the NYPD Deputy Commissioner's Office is refusing to confirm or release any details.

NYPD crime investigation teams search the park where Tessa was killed for evidence

Police divers continued to search the pond in the park on Friday morning for more evidence

The diver was seen pulling several things from the water. He searched as detectives quizzed a second suspect at a nearby police station

Divers after searching the pond on Friday. Police are still looking for a third suspect

The park remained closed off to the public on Friday

All three fled and she was left to crawl to a nearby security booth for help. The 18-year-old was later pronounced dead in the hospital. Officially, the NYPD is saying nothing about the boys.

After his arrest, the 13-year-old's aunt told The New York Daily News that the police had the wrong boy.

'He didn’t do this. My nephew did not do that.

'We don’t know what’s going on. I’m sorry for that young woman, I am sorry for her family. But I know my nephew did not do this,' she said.

The teenager's mother is dead. He told police sources he did not stab Tessa but that his friends dead.

Police are still questioning the second and third suspects.

Majors was walking into Morningside Park near Columbia University at 5.30pm on Wednesday when she was attacked.

She put up a fight when her attackers asked her for money, and was stabbed repeatedly in the stomach, neck and face.

The teenager crawled to a nearby security booth but collapsed and was later pronounced dead in the hospital.

Her family from Charlottesville, Virginia, are now in New York City. It has since emerged she was the grandniece of former NFL football player Johnny Majors.

The stabbing rocked the community at Barnard, an all-girls school, and has sent shock waves through nearby Columbia University too.

Mayor Bill de Blasio vowed on Thursday that detectives would resolve the crime quickly.

He has come under fire for escalating murder rates in the city in recent months.

Tessa, a budding musician who also had hopes of becoming a journalist, had only been living in the city since August.

Much of the park remained closed off on Friday as authorities continued investigations

A $2,500 reward is being offered for information about the incident. A poster is shown advertising the reward

Tributes at the park for Tessa on Friday. The teenager's death sent shockwaves through the city

'OUR HEARTS WILL NEVER BE THE SAME': TESSA'S FAMILY GRIEVES Tessa with her parents, Christy and Inman The teenager's parents traveled from Charlottesville, Virginia, to New York on Thursday after learning the news. They released a statement later in the evening to tell of their grief, saying: 'We lost a very special, very talented, and very well-loved young woman. 'Tess shone bright in this world and our hearts will never be the same.' The teenager had only been in New York City since August, when she was dropped off at college by her mother. She was excited to start classes at the all-female Barnard College. Tessa's grandmother said after news of her death spread that she was likely too 'naive' to know not to walk alone in a park. However students at the school said it was barely nightfall when she was attacked, and that they too would not have thought twice about entering the park at that time. 'It could have been any one of us,' one female student said on Thursday. Tessa and her mother Christy, when Christy dropped her off in New York in August for college Advertisement

Flowers are laid near the entrance of Barnard College on Thursday in honor of the slain freshman