ORANGE COUNTY, Fla. -- Monday, the funeral will be held for the 15-year-old who was killed at University High School in Orange County.

Over the weekend, family and friends of Michael Nieves also paid tribute to the teenager whose young life was cut short. There was an emotional memorial Sunday at the Cathedral of Faith. More than 4,500 people came to grieve the loss of the teen.

Saturday, the little league baseball team that he cherished honored Nieves with a special tribute.

"God bless you and I am sorry you are going through this. Let this tree be strength to this field and strength to this family," a voice said over the public address system.

As a tree was planted in her son's honor, Nieves' mother, emotionally distraught, got down on the ground and helped.

"Terrible. It's been really hard. There's no words to describe what we are going through with everybody," said Dennis Felibri, Nieves' uncle.

The 15-year-old high schooler was killed last Thursday by another student. The two had been arguing over a girl.

Louis Harris coached Neievs since he was a child. He said he still can't believe the little boy he watched growing up is now gone.

"He was such a good kid. I can't understand why this would happen. He was loved by so many people," Harris said.

Parents and teammates said Downey Park was Nieves' second home. He was part of Union Park Little League and was on the all-star team.

"His teammates are taking it very hard. When you grow up from tee-ball and get to this point, he's not going to be here anymore," said Hector Bonilla, his all-star team manager.

Investigators said 17-year-old Kelvin De La Cruz killed Nieves after the two argued about a girl. De La Cruz has been charged with first-degree murder.