Authorities are investigating the death of a 73-year-old experienced skydiver in Arizona, after his parachute did not fully deploy during a jump.

Eloy Police said the incident happened just after 12 p.m. on Wednesday when Terry Gardner, 73, and three other skydivers were making their third jump of the day with Skydive Arizona. 

Police added that the group had planned a formation jump from an altitude of approximately 14,000 feet, but were unable to complete the intended formation.

Police said the formation didn’t go as planned as Gardner experienced complications when he attempted to deploy his parachute. While the other three skydivers landed safely, Gardner’s parachute never fully deployed to slow his descent.

Eloy Police released the names of the victims killed in a hot air balloon crash on Sunday in Arizona.  (Credit: FOX 10 Phoenix)

An “unspecified problem” with the “envelope” of that balloon may have led to the fatal crash, investigators confirmed to the Associated Press.

 The “envelope” is the bag that fills with hot air to make the balloon rise.