Members of the South Norwood Animal Rescue Liberty (SNARL) found the head of the black and white moggy last Friday but have so far been unable to find the body.
Police advised the group not to give out an exact location of where the head was discovered but SNARL co-founder Toby Jenkins confirmed it was in the Beckenham area, according to News Shopper.
This makes it the second time this month that the killer has targeted animals in Bromley, south-east London, after a cat was found with a broken neck and a partially skinned leg on August 10.
SNARL have now put out an appeal on Twitter to find the body of the latest cat victim.
The Croydon cat killer hit the headlines in 2015 when headless cats were found in Croydon and other parts of London.
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The Metropolitan Police have an open investigation into the culprit, who is also known as the M25 animal killer.
Anyone with information should contact SNARL on 07961 030 064 or the police on 101.