Mounties are working with the SPCA on a profile of the person behind a in Maple Ridge.

The investigation into the deaths remains active, but the SPCA is unable to share specific details about it to protect its integrity.

The RCMP are also trying to extract human DNA from the remains.

鈥淲e don鈥檛 want to jeopardize the outcome,鈥� said SPCA spokesperson Lorie Chortyk.

鈥淏ut we can say that the B.C. SPCA is working with the Ridge Meadows and 91原创 RCMP and that the SPCA has the support of the RCMP鈥檚 Behavioural Science Group to track and analyze the reports we receive.鈥�

In the past year, 24 cats have been discovered mutilated in Maple Ridge, but the SPCA is now investigating similar incidents in Mission, Port Coquitlam and .

Necropsies done on cats killed in November 2011 and March 2012 found the injuries were caused by a sharp instrument, not by a predator.

The SPCA isn鈥檛 ruling out that a coyote could have caused a few of the deaths, because attacks can look similar. But it fears many of the felines died at the hands of a disturbed person.

Cat heads have been found outside a school, placed on a person鈥檚 porch and in a plastic bag. A tail was found under a missing cat poster, while another was tacked to a fence.

Those acts are unlikely to be the work of a coyote or dog, Chortyk said last week.

鈥淎t this point, we just don鈥檛 know if it is one person 鈥� we are expanding the investigation next week,鈥� she added.

鈥淲e do have to be careful about how much information we share or we will jeopardize the investigation.鈥�

Dr. Melinda Merck, a veterinary forensic expert, arrived in B.C. on Tuesday and was expected to begin necropsies on the cats Wednesday afternoon.

A renowned from Atlanta, Merck investigated the Whistler sled dog killings and helped build a case against NFL player Michael Vick for his involvement in a dog-fighting ring.

She frequently testifies as a forensic expert for animal cruelty cases around the U.S.