A suspect has been arrested in connection with a double homicide at an Arkansas park, after a married couple was found dead on a walking trail over the weekend, authorities said.

James Andrew McGann, 28, of Springdale, Arkansas, was arrested Wednesday and charged with two counts of capital murder in the killings of Clinton David Brink, 43, and his wife, Cristen Amanda Brink, 41, Arkansas State Police announced Wednesday evening.

The Brinks were "fatally attacked" while out hiking with their two daughters at Devil's Den State Park on July 26, police said. The children, ages 7 and 9, were not harmed in the incident.

Police previously said the suspect was seen leaving the area in a black, four-door sedan, possibly a Mazda, with a license plate covered by tape, police said.

Arkansas State Police had released a composite sketch and photo from behind of a man who was seen in Devil's Den State Park on Saturday, the day of the killings. Police asked for the public's help in identifying the man, who they said was wanted for questioning in connection with the double homicide.

The FBI was assisting Arkansas State Police with its investigation "by providing additional manpower and specialized resources."

Police have not yet revealed how the Brinks were killed.

The Brinks had recently moved to Prairie Grove from another state, police said.

The children are safe and in the custody of relatives, according to police.

All trails at Devil's Den State Park are closed until further notice.