March 27, 2010: Robert Krentz sets out to check wells on his 35,000-acre ranch about 35 miles northeast of Douglas.

10 a.m. - Is heard on a handheld ranch radio telling his brother to contact the U.S. Border Patrol because he has found an illegal immigrant who needs help.

11 a.m. - After getting no answer on radio and cell phones, his son, Frank Krentz, and brother, Phil Krentz, start searching for him.

6:22 p.m. - Neighboring rancher calls the Cochise County Sheriff's Office to report Krentz missing. Agency's search-and-rescue team arrives about two hours later.

11:43 p.m. - Search helicopter spots Krentz's body about a half-half mile from his last known position.

March 28, 6:10 a.m. - As the sun rises, investigators get a better look at the crime scene and begin tracking shoeprints south.

3:40 p.m. - Investigators - and a crew of trackers including mountain lion hunter Warner Glenn, his adult daughter, Kelly Glenn-Kimbro, and rancher Ed Ashurst - track footprints of the suspected killer about 20 miles due south to the border.

The tracks show the killer knew knew his way around the rugged terrain and was trying to conceal his path, Warner Glenn said.