NEW YORK (AP) — Letters from John Lennon's killer detailing his obsession with the novel "The Catcher in the Rye" to the police officer who arrested him went on sale Monday through a Los Angeles auction house.

The four missives from Mark David Chapman to Stephen Spiro are for sale through Moments In Time, which specializes in historical documents and rare autographs, at a fixed price of $75,000, auction house owner Gary Zimet said. Zimet is selling the letters on behalf of Spiro, who arrested Chapman on Dec. 8, 1980, shortly after he shot Lennon outside The Dakota, the ex-Beatle's Manhattan apartment building.

The letters are typed and signed by Chapman. They were written over several months in 1983, after he had pleaded guilty and been sentenced to 20 years to life in prison.