STAMFORD, Conn. (AP) — A prosecutor said Friday that Kennedy cousin Michael Skakel will not face a second trial in the killing of Martha Moxley, an announcement that came 45 years to the day after the teenager was bludgeoned to death in her wealthy Connecticut neighborhood.

Chief State’s Attorney Richard Colangelo Jr. said at a hearing at Stamford Superior Court that the case could not be proven beyond a reasonable doubt.

Skakel, a nephew of Robert F. Kennedy’s widow, Ethel Kennedy, was convicted of murder in 2002 and sentenced to 20 years to life in prison. Several appeals followed. After serving 11 years behind bars, Skakel was freed in 2013 on $1.2 million bail after a judge overturned his conviction, saying his trial lawyer failed to adequately represent him.

The state Supreme Court upheld that ruling in 2018, and the U.S. Supreme Court declined to hear the state’s appeal last year.