By Susy Solis, CBS 11 News

WYLIE (CBSDFW.COM) – The flag is at half staff at Wylie East High School following the murder of  15-year-old cross country runner, Nahum Martinez.

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But instead of mourning his death, friends and teammates from the cross country team celebrated his life with a Memorial run in his honor Sunday evening.

Teddy bears, flowers and cards now sit at the storm drain where Martinez’s body was found by a passerby early Saturday morning. A murder weapon and other evidence was found in an open field nearby.

The investigation continues into Martinez’s murder, but one day after it happened, police declined to release further information about crime, including the circumstances surrounding the shooting and why.

Two 14-year-old boys are charged in his murder. Their names are not being released because they are juveniles.

Close to 200 classmates gathered for a run in Martinez’s honor at Wylie East High School. Martinez was a kind-hearted teenager, who accepted anyone and everyone and dreamed of attending the University of Texas in Austin, friends say.

Martinez’s best friend and teammate, Grant Buley, was shocked and saddened by his friend’s sudden death. When he visited the Martinez family to offer condolences, his friend’s father had some sage advice for him.

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“His dad said, ‘You know, every time you run, you know he is going to be right there with you, pushing along,’” said Buley.

Martinez’s parents later showed up to the memorial run in honor of their son, but declined interviews. They wept as friends hugged them and offered condolences.

Martinez’s aunt told reporters in Spanish that she wanted the world to know that Nahum was an angel who touched many lives.

For Buley, the several mile was run was cathartic.

“I think Nahum was telling me to go more. I just kept on running,” he said.

Counslers will be available for students at Wylie East High School Monday.

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The investigation into his death continues.