NEW YORK (AP) - An investigative reporter and a police detective, both of whom spent years trying to solve the murder of Martha Moxley, are collaborating on a book about the case that ended with the conviction of Kennedy relative Michael Skakel.

``Conviction,'' by Newsday reporter Leonard Levitt and Connecticut police detective Frank Garr, is scheduled to be published by ReganBooks next summer.

``No matter how difficult the circumstances, no matter how many obstacles were thrown their way, they believed that justice should prevail. And they never sold out in the process,'' ReganBooks publisher Judith Regan said in a statement Tuesday.

Financial terms weren't disclosed.

Skakel, a nephew of the late Robert F. Kennedy, was convicted in June of beating Moxley to death with a golf club in Greenwich when they were 15-year-old neighbors in 1975. He was sentenced to 20 years to life in prison in August.

His attorneys have cited numerous issues they plan to raise on appeal, including a statute of limitations and the transfer of the case from juvenile to adult court.

A formal appeal to the Connecticut Supreme Court is expected to be filed in a few months.