A retired firefighter who was being investigated for allegedly possessing "horrific" child sex abuse material was shot and killed by Florida police when he pulled a gun on officers.

Seminole County Sheriff Dennis Lemma said 68-year-old Gary Guckenberger came out of his home on Hatfield Court in Longwood and refused to follow orders from officers who were surveilling him.

'It included bondage, sexual batteries, and the most horrific examples of abuse and neglect that any human being could ever imagine.'

Sheriff Lemma said the police department received a tip about Guckenberger and performed a search at his home before finding the material on his devices. The incident unfolded later as police were surveilling him.

"As we were conducting surveillance, Gary Guckenberger came out of his h

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