Should he have died?

On May 28th at the Cincinnati Zoo, 3-year-old Isiah Dickerson fell into the gorilla enclosure with Harambe, a 450 pound male silver-back gorilla. For about 10 minutes, Dickerson was carried and dragged through the water in the gorilla enclosure by Harambe. After a difficult decision, Harambe was shot and killed by zoo security in an effort to save the child. People are debating whether Harabme should have  been shot and killed?