A Bengal cat is believed to have been strangled with a mobile phone charger and the socket 'shoved' down its throat.
The dead cat was discovered by a passerby with the car charger wrapped around its neck inside a blue carrier bag on a walkway in Newark, Nottinghamshire earlier this month.
The owner of the cat has been traced and informed of its death in Beacon Hill.
Investigating RSPCA Inspector Ian Callingham called the attack 'sickening'.
"This is just an awful case of animal cruelty and it is sickening to think of how much a painful death this cat would have died.
"It is very bizarre and it is strange that someone would then just dump the body in a busy area."
Anyone with information is urged to contact the RSPCA on 0300 123 8018.