Lilly, 1, was hit and killed by a carload of teenagers in Palmerston North.
Carloads of teenage boys hit a pregnant cat, cheered, then sped off only to return and pull the fingers at its distraught owners.
Palmerston North woman Natelle Smith is now on a hunt for the teens to bring them to justice.
Smith was outside her house about 9.30pm on Thursday night and her pregnant tabby cat Lilly was sniffing around her friend's car at the bottom of the driveway.
A silver Subaru and another gold Subaru came "spinning around the corner" and the silver car hit Lilly. The boys in both cars cheered and raised their arms.
Smith said her other cat, Flash, who is Lilly's brother, started howling and tried to pick up his dead sister.
Lilly belonged to Smith's son's girlfriend Brittany Ekenasio, who lives with Smith.
"We're all pretty distraught, as you can imagine.
"It would be different if it was an accident and they took off because they were worried, or anything.
"But the fact that they came back while we were trying to console the children and pick up the cat then they came back and tormented us, no normal people do that."
Smith lives opposite a dairy and has reviewed his CCTV footage to find the number plate of the car but it's not visible in the images.
She's reported it to the police.
Ideally, she'd like to see them charged or held responsible for their actions.
Smith is hoping someone's conscience will get the better of them and come forward or someone will know who owns the car as it's a "very unique colour".
"Someone will hopefully know something, see something and say something.