Police say a man who forced his way into a 28-year-old woman's apartment at St. Nicholas Avenue and 147th Street Monday night and raped her at knife point is the same perpetrator suspected in a series of Upper Manhattan sex assaults. Officers fanned out across Hamilton Heights last night to distribute fliers with surveillance photos and a police sketch of the suspect, and a $12,000 reward is being offered for information leading to an arrest and conviction. He's described as "a black male in his thirties, about 5-foot-9 to 6-feet tall, wearing a black hoodie, blue jeans, and white sneakers with red stripes on the sole." The suspect was caught on camera on August 10 after raping a 23-year-old at West 144th Street and Convent Avenue, and through DNA investigators have linked him to two other rapes, of a 69-year-old woman and a 59-year-old. Residents in the area are considerably alarmed, and Hamilton Heights local Edna Kirk tells NY1, "I feel terrible. I'm just hoping he doesn't come to me. I feel awful bad about this and I hope they hurry up and catch this guy."