James Andrew McGann, 28, was arrested at 4:57 p.m. local time on July 30 at a business in Springdale, Arkansas, state police said.

Clinton David Brink, 43, and Cristen Amanda Brink, 41, were found dead Saturday at the park in Washington County, police said. They were hiking with their daughters, ages 7 and 9.

A 28-year-old Arkansas man was arrested Wednesday in the killings of a married couple in front of their children at Devil’s Den State Park over the weekend.