Transcript for July 25, 1999: Cary Stayner arrested for the murder of a Yosemite wildlife guide
And now the Yosemite murders tonight FBI investigators are asking themselves whether they could have prevented the murder of a young naturalist in the national park. The man they have arrested was questioned once before. Investigators interviewed him earlier this year in connection with three other murders back then they released him. Tonight there wondering why. We begin with ABC's Lisa salters. I think FBI officials made the announcement this afternoon. That they now believe the murders of three missing sightseers at Yosemite National Park. Are linked to the recent killing of 26 year old Joey Armstrong a Yosemite wildlife guide. We now believe there is a connection between Armstrong murder. And Immersion of Carol's son or daughter Julie Stein and her family friend Selena below so. Authorities say their suspect is 37 year old Carrie stinger a handyman at the cedar lodge near Yosemite the last place the tourists were seen alive. The police won't disclose how Stater became a suspect in both murder cases. They say they have found considerable evidence in the last 72 hours since discovering Armstrong's decapitated body last Thursday in the park near her home. We do not believe that there is anyone else there on the loose. Who is not. In custody. But authorities have made that same claim before. Just a few months ago information was leaked out but the sun closed so investigation. Was focusing on two Brothers who are already behind bars on unrelated charges. It now appears police were on the wrong track. A struggle with that issue for the last 24 hours and continue to do so. I'm confident that we've done everything it reasonably could have been done. For family members of the original victims today's announcement is comforting news. Though they too thought the case had been salt. This time authorities seem confident that the killings will stop. They say the alleged killer carry stain or will be formally charged with the Armstrong murder tomorrow. Lisa salters ABC news Sacramento.
This transcript has been automatically generated and may not be 100% accurate.