It happened on Wednesday afternoon.
The 31-year-old man fell 35 feet from a tower outside of the stadium. He worked as a rigger -- a person who specializes in moving large, heavy objects high above ground.
Officers from the Glendale Police Department and paramedics from the Glendale Fire Department responded to the incident, according to Sgt. David Vidaure with the Glendale Police Dept.
He was rushed to a hospital where he was pronounced dead.
There might have been some type of medical condition that led to that fall.
Hundreds of people showed up to work at the stadium on Thursday morning but they were sent home.
Sgt. Vidaure said the Industrial Commission of Arizona will conduct the formal investigation.