A twisted kitten killer who microwaved cats for fun is back living in his family’s nearly $1 million home after serving just one day of a four-year prison sentence.

Thomas Martel, 25, returned to the six-bedroom property in the affluent Chicago suburb of Northbrook following his extraordinary same-day release from prison.

The 3,056-square-foot home has two-and-a-half bathrooms, two fireplaces and an attached garage.

Martel pleaded guilty to animal torture and aggravated cruelty to animals after prosecutors said he drowned, microwaved and decapitated kittens.

He was sentenced to more than four years in prison but received credit for more than 1,000 days spent on electronic monitoring while his case was pending.