MIAMI (CBSMiami) – A South Florida doctor is accused of torturing a dog tied to a tree before eventually killing it.

Dr. Isaias Lerner, a cardiologist who works with the South Broward Physicians Group in Coconut Creek, has been charged with one count of animal cruelty with intent to kill.

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On Thursday, police were called to Lerner’s home on East Broadview Drive on Bay Harbor Island. According to the arrest report, one witness told the officer that they saw Lerner hitting a dog tied to a tree over the head with a hammer.

A second witness told police, at one point, Lerner stabbed the dog in the head around its ear and throat area with a screw driver. The doctor allegedly moved the screw driver around in a grinding manner as the dog yelped in pain and what looked like brain matter dripped from its head.

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The dog then slumped to the ground and died.

During questioning, Lerner reportedly admitted that he struck the dog a number of times on the head with a hammer. He said the dog ‘wobbled for a while then passed away’, according to the report.

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Lerner was arrested. He walked out of jail Wednesday afternoon after posting $5,000 bond.