An elderly man is behind bars after he poisoned his neighbor’s cats in Biscayne Park by leaving out trays of tainted food, authorities said.

A family is mourning after two of their cats had to be put down. Investigators said both pets suffered extensive kidney damage caused by eating poison.

One of the cats’ owners, who identified herself as Katherine, spoke with 7News on Thursday.

“A generous read would be that [my neighbor] has a gross misunderstanding of how you would deal with a problem with animals,” she said.

Katherine said she made the horrific discovery when she returned to her home over the weekend to find one of her cats sick.

“When I called her name, she couldn’t get up; she could only lift her head,” said Katherine.

After rushing the 1-and-a-half year old cat, named Littl

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