The SPCA says its staff members are "extremely disturbed by this case," especially since three more kittens, all less than two months old, were found dead yesterday morning.
The cause of death in the most recent cases isn't clear, but the SCPA says it suspects poisoning.
SPCA asks for public's help
There have been other cases of cats being poisoned in the area in recent months.
A news release on the SPCA's website called the slayings "heinous acts of cruelty."
The SPCA is investigating, but it says it lacks critical information.
The organization is offering a $2,000 reward to anyone who can provide information leading to the apprehension and conviction of the person responsible.
Anyone with information related to the case is asked to contact the SPCA's inspection department at email@example.com or 514-735-2711 ext. 2230.