Gordy, one of three adult male gorillas at St. Paul Como Zoo died last Monday.
Zoo officials say the cause of Gordy's death is unknown pending an autopsy report, the Star Tribune reported.
Zoo staff found Gordy collapsed and unresponsive, and tried unsuccessfully to resuscitate the gorilla with chest compressions and a dose of epinephrine, Fox 9 News reported.
The most common cause of death among gorillas is heart disease, and the average lifespan is between 25 and 35 years, Fox 9 News reported. Gordy was 23.
Gordy arrived at the Como Zoo in 1991, after living at the San Diego Wild Animal Park, the Star Tribune said.