Trapuzzano was gunned down during the early hours of March 31 on the west side of Indianapolis as he took his daily fitness walk.
Nathan and his wife, Jennifer, used to volunteer with the city's pro-life ministry, Truth and Compassion. The couple was expecting a baby within the next month.
Police say they have arrested 16-year-old Simeon Adams, who is recovering from a gunshot wound he received on April 1 in another altercation.
Adams' distinctive clothing could be seen on surveillance tapes. Marion County Prosecutor Terry Curry adds that “statements had been given by witnesses implicating Mr. Adams in the shooting.”
Officials say robbery was the motive.
The young man has had scrapes with the law since he was nine-years-old in 2007. A local minister said he recently caught Adams trespassing with a gun in his hoodie.
Adams will be tried as an adult.
Police say they know the identity of the second suspect, as well.
“Oh how my already wounded heart aches to hear this,” his widow, Jennifer, wrote on Facebook. “Nate always said one of the greatest crimes in the world today is how many babies grow up without their father.”
“I don't know this man's circumstances, but it hurts to hear that such a young man could turn to such violence,” she said. “Please pray for his conversion.”
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As of this writing, the couples' GoFundMe page has raised $160,135 toward his funeral arrangements and to support his unborn child.