WASHINGTON, D.C. — Eric Tarpinian-Jachym was 21 years old, from a small town in western Massachusetts, and spending the summer doing exactly what a kid like him was supposed to be doing: interning in Congress, studying hard, building a future.

On the night of June 30, he was in the wrong place at the wrong time.

Three armed suspects jumped out of a stolen vehicle near the 1200 block of 7th Street NW, pulled on latex gloves, and opened fire on two young men. More than 70 shots rang out across the block. A woman was hit. A 16-year-old boy was hit. Tarpinian-Jachym was hit four times.

He was rushed to the hospital. He died the next day.

He wasn't the target. He was a rising senior at UMass Amherst, from Granby, Massachusetts, interning for Rep. Ron Estes, a Republican from Kansas. He had no connection to whatever dispute drove the shooters to that corner.

Now the evidence is catching up.

Prosecutors revealed in a DC Superior Court hearing on Friday that DNA recovered from shell casings at the scene is an "overwhelming statistical match" to Jailen Lucas, who was 17 at the time of the shooting. Additional DNA testing also connects Kelvin Thomas Jr., also 17, to the attack.

Both were arrested on September 5 and charged as adults with first-degree murder while armed. Both have pleaded not guilty.

A third suspect, 18-year-old Naqwan Antonio Lucas, Jailen's older brother, was arrested on October 29 in Germantown, Maryland. Same charge. Same plea.

And Naqwan Lucas wasn't done. Four days after the shooting that killed Tarpinian-Jachym, prosecutors say he murdered 17-year-old Zoey Kelley, who was found dead of a gunshot wound inside a Washington apartment on July 4. He has been charged in her killing as well.

Tarpinian-Jachym grew up in Granby, a town of about 6,000 people in the Pioneer Valley. He landed a congressional internship through the Fund for American Studies. It was the kind of opportunity you tell everyone about back home.

He never made it back.