The “Croydon cat killer” is believed to have struck again overnight after a decapitated feline torso was found on Hayfield Road in Orpington.
Animal charity South Norwood Animal Rescue and Liberty (SNARL) says this is the 30th cat death in the series.
“We now have 31 cases confirmed by post mortem, with around 90 since Feb 2016 which bear the hallmarks of what is believed, through forensic evidence, to be the same killer,” the charity said.
A representative from SNARL, Boudicca Rising, said: “If you live in Greater London you are currently living in a high risk area for these killings.”
“We advise that anyone living in the greater London area keep their cats indoors as much as they can and let them out only during the day when they can be supervised,” Ms Rising added.
Cat victims have been found as far away as the Isle of Wight and Berkshire.
“Every case is being looked at individually. Some are found to have definite links to the other deaths, but some of the cases we are called about turn out to be unconnected. It is too soon to say whether this particular cat, found so recently, is connected or not,” said an RSPCA spokesperson.