Zookeepers decided to shoot the bear after a tranquilizer gun didn't work, according to the Daily Mail.
Baloo had shown signs of frustration and aggression ever since he arrived at Bojnice from the Czech Republic. Even if zookeepers had managed to catch him and put him back into his enclosure, they feared he would try to escape again.
"A vet first used a tranquilizer gun, but without success," Andrea Klasova, a zoo spokesperson, told the Daily Mail. "As a result, we had to kill the animal - in the name of security for everyone."
Baloo couldn't be released into the wild either, the zoo wrote on Facebook after the incident, "because [he had] lost ... shyness in front of people."