HAMILTON — A murder suspect told police he was trying to be nice when he spotted Tracey Jean Roark standing on a street corner and offered to take her to a store in his van.

        Martin Delores Rivera- Carrillo also told police he didn't know that Ms. Roark, 38, was a prostitute, didn't pick her up for sex and didn't remove her undergarments.

        He said the woman tried to steal $40 from his van, then lunged at him with a box-cutter-type knife before he reacted in self-defense — and stabbed her multiple times before he pushed her body out of the van and she bled to death.

        Those statements — on a videotape played in Mr. Rivera-Carrillo's trial Tuesday in Butler County Common Pleas Court — differed from the story the suspect originally told, police said Tuesday.

        On July 15, after police spotted Mr. Rivera-Carrillo driving a van with blood all over its interior, he explained the blood had come from a slaughtered calf.

        But hours later, after police found Ms. Roark's body, Mr. Rivera-Carrillo said that story was a lie. Then, on videotape, he told the story that he said was the truth.

        “I did this whole thing in self-defense,” the suspect said in a signed summary of his videotaped interview.

        Mr. Rivera-Carrillo is accused of stabbing Ms. Roark more than 40 times.

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