WASHINGTON, D.C. (DC News Now) — The third suspect in the killing of a Capitol Hill intern was arrested Wednesday, the Metropolitan Police Department announced.

Police said the 18-year-old was wanted for his involvement in two deadly shootings, and a $75,000 reward was offered for information leading to his arrest.

Investigators said the suspect and two 17-year-olds, Jailen Lucas and Kelvin Thomas Jr., were responsible for the killing of Eric Tarpinian-Jachym, 21.

Tarpinian-Jachym, a University of Massachusetts Amherst student, was interning in the office of Rep. Ron Estes (R-Kan.). Tarpinian-Jachym was walking near the Mount Vernon Square Metro Station on the evening of June 30 when he was shot.

U.S. Attorney Jeanine Pirro gave an update on the shooting during a press conference on Th

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