A SUSPECTED serial cat killer who allegedly sexually abused and then slaughtered 21 animals was arrested after cops found him passed out in his car next to a dead female tabby.

Robert Roy Farmer, 25, was taken into custody before admitting 21 counts of felony animal cruelty – one for each of his feline victims.

3 Robert Roy Farmer allegedly sexually abused and killed 21 cats Credit: SVCN SVCN SVCN

CCTV has emerged showing farmer creeping up on his prey.

But before he is sentenced a judge in the California case wants to hear from a psychologist about whether Farmer should could go on the sex offenders register, The Mercury News reports.

It came after the judge was reportedly told he had sexually abused the cats before killing them.

A San Jose Animal Care and Services post-mortem examination on the female tabby cat found dead in his car showed it suffered blunt force trauma.

3 Here Farmer can be seen sneaking up on a cat Credit: San Jose Police Department

3 Farmer then lures the pussy over to him before attacking the poor animal

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The cat also allegedly had signs of sexual assault and a DNA match between Farmer and the cat was found under its claws.

Other DNA tests linked Farmer to all 21 cats that were killed.

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