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Muhammad was executed for his role in the crimes in 2009.

Malvo, a teenager at the time, was sentenced to life in prison without parole.

Leslie McDermott, spokeswoman for Brookside Gardens, said victims’ families occasionally make their way to the reflection terrace, as do visitors to the park. On Thursday, several bouquets of flowers lay drying in the late-morning humidity at the foot of the 8-foot upright stone that bears the names of the victims.

Ms. McDermott said the atmosphere in the area changed when the pair were caught.

“You felt like you could go out and breathe again,” she said. “You didn’t feel like you had to duck and cover. You felt more safe.”