Nahum Martinez, 15, who was shot and killed on March 31, 2012. (Credit: Wylie ISD)

ROCKWALL (CBSDFW.COM) – Nahum Martinez should’ve been running for the Wylie East Junior Varsity track team in the big district meet in Rockwall Monday.

Martinez, who was only 15, was shot dead in Wylie over the weekend.

His body was found around 5:30 Saturday morning at a sewer drain on the 600 block of Linden Avenue.

Two 14 year olds have been arrested in his death.

Jason Olford was his track coach.

“I loved him so much. He’s definitely going to be missed,” Coach Olford said. ”Not to see him smile. Not to hear his voice. Just the little things you take for granted. Hurts. It really does.”

There was a moment of silence at Wilkerson-Sanders Stadium for everyone to remember Nahum Martinez Monday.

He should have been here, lining up alongside Edwin Walker, his teammate in the 3200 meter run.

“I just wish he was here to run it with me. Because this was his biggest race –– district. And, it’s his first year. It really meant a lot to him,” Walker  said.

He had to run without Martinez, but dedicated the run to his friend. Walker came in first.

He had never finished first in that race before, but he did it, beating 17 other runners.

“Coach told me to do it for Nahum. And I knew he’d want me to get first place because he always wanted me to get first place,” Walker said.

Nahum Martinez should have been here. Investigators are trying to figure out why he’s not.

As for the future of the Wylie East track team, their coach says they’re just going to take it one step at a time.

Nahum’s aunt, Mariana Garza, said if the teenagers who were arrested in Nahum’s death are charged with murder, she wants them tried as adults.