LITTLE ROCK (API - Ten men were seated as jurors in j the first degree murder trial of James Dean Walker, 22. of Reno, Nev., in circuit court here Tuesday. IHe is charged with shooting North Little Rock Policeman Jerrell P. Vaughan in a gun-fight April 16. 1%3.Vaughan had stopped a car outside North Little Rock after Walker and another man had been involved in a fight in a Little Rock club.Prosecutor John Jemigan qualified the jurors for the death penalty.Walker pleaded innocent and innocent bv reason of insanity at his arraignment. Defense Attorney Harold Hall said thepleas would be maintained.Judge William J. Kirby imposed tight security on the courtroom, with state and city■ T w h 1