WILMINGTON, Del. (AP) _ Three men, including a meat dealer convicted of selling tainted beef in four states, have been indicted on murder charges in the slaying of a federal drug informant whose body was found buried behind a shopping center.

The indictments issued this week by a New Castle County grand jury accuse Vincent L. Perry, of West Chester, Pa., Louis J. Summa, 32, of Chester, Pa., and Charles Kevin Kelly, 34, of Boothwyn, Pa., of first-degree murder in the 1983 death of Christopher Walker. The indictments also accuse the three men of conspiracy and possession of a deadly weapon during the commission of a felony.

Walker, 22, disappeared a week before he was to testify against Perry in a federal drug case. The federal Drug Enforcement Administration and the FBI launched an investigation, and his body was recently found in a shallow grave.

Dr. Ali Hameli, the state medical examiner, said Walker died of multiple gunshot wounds and that lime placed on the body, apparently with the intent to speed decomposition, helped to preserve it.

The indictments were unsealed Thursday, a day after Summa was arrested in Pennsylvania.

Perry is serving two years in prison in Pennsylvania after being sentenced last July for selling tainted, uninspected meat to three New Castle County, Del., school districts, the Dover Air Force Base, and other government institutions in Pennsylvania, New Jersey and Arkansas.

He is also serving another federal sentence for selling methamphetamine. He was convicted based on evidence in tape recordings Walker had made of the drug transactions.

Kelly was convicted of the 1983 kidnapping of an Elkton, Md., woman and is in prison in Pennsylvania.

Summa, who was an employee of Perry's, is being held in Pennsylvania without bail as a fugitive from Delaware pending extradition proceedings.

Kathleen M. Jennings, a deputy state attorney general, said all three men face the death penalty in the Walker case if convicted.