A bullied teen's last tweet revealed her despair from relentless teasing two days before she jumped in front of a train in New York City.

Felicia Garcia, 15, was reportedly tormented by her peers at Tottenville High School, who teased her about sexual encounters with football players, police sources told the New York Daily News.

On Wednesday, Garcia killed herself in front of classmates at a Staten Island train station. Her friends believe that Garcia's final Twitter post on Monday showed that bullying had become intolerable.

"I cant, im done, I give up," she tweeted.

The New York Times reports that Garcia went through hardship throughout her young life. Her parents died when she was young, she ran away from her aunt's house with an older man at one point, and later she bounced around in the foster care system.

But bullying at school apparently was the final straw.

"Kids are saying she had sex with some guys from the football team at a party after the game," Garcia's friend, who wanted to remain anonymous, told the Daily News. "Later on they wouldn't leave her alone about it. They just kept bullying her and bullying her."

Detectives told the paper that they're in contact with at least two 17-year-old boys who allegedly took part in the bullying. The four football players involved in the story surrounding Garcia were also interviewed. They are between the ages of 15 and 16. Detectives said there aren't any charges pending.

Sara Brager, 16, told the Daily News that she heard Garcia's final words before she fell backward onto the tracks, directly in front of the train.

"Just before she fell, she said, 'Finally, it's here,'" Brager told the paper. "It was the most horrible thing I've ever seen."

Need help? In the U.S., call 1-800-273-8255 for the National Suicide Prevention Lifeline.