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The ex-cop busted in the heartless stabbing of jogger Katie Suarez had the woman’s blood splattered all over his apartment walls — and he had desperately tried to scrub it away before police found him, prosecutors revealed as he was arraigned late Saturday.

Sayed Mohassib, 27, stood in flip-flops and a matching Von Dutch outfit during the hearing in Brooklyn criminal court, as prosecutors said cops had found the forensic evidence shortly after the accused killer was found at his Bensonhurst address earlier in the day.

“The defendant stated that he had tried to clean the blood,” Assistant District Attorney Jordan Rossman said.

Sayed Mohassib appears in Brooklyn Criminal Court for his arraignment in Katie Suarez’s killing, Nov. 7, 2026. Kevin C. Downs for NY Post

Katie Suarez was stabbed to death while jogging on Brooklyn’s Shore Parkway Greenway on Oct. 30.…