Tennessee State Trooper Adam Cothron was shot July 22 during a traffic stop on Interstate 40.

Now he and his brother Grant, who is also a law enforcement officer, are calling for tougher sentencing for repeat offenders, WKRN reports.

The shooting led to days of searching by law enforcement across Tennessee and even over state lines. Both suspects, Braze Rucker, 29, and Timothy Davis Jr., 25, were taken into custody.

However, the Cothrons were left with questions.

“After this happened, having some conversations with Adam bedside, some conversations got brought up and they’re conversations that need to happen,” explained Grant. “But the biggest question that we want to raise is: Why are these guys out to be able to do this kind of violence, to do this kind of crime?”

During a press conference after the last arrest, Metro Police revealed that Rucker was convicted of second-degree murder in 2016 and sentenced to 11 years in prison. The following year, he was convicted of aggravated assault and especially aggravated robbery. He was sentenced to 14 years in prison.