A woman accused of killing a Quantico Marine Base corporal who was assisting an inquiry into an embezzlement scheme told police she began stealing funds after two men threatened to kill her and her mother if she didn't get money for them, a police investigator testified yesterday.

Investigator Richard Cantarella of the Prince William County Police Department testified in General District Court in the preliminary hearing of Markeithia Reene Reeves, 24, of Suitland, who is charged with first degree murder in the March 5 shooting of Cpl. Estella Pearson.

Tania Theresa Morton, 23, of Arlington, who is suspected of participating with Reeves in a scheme apparently involving payment of travel money for trips never taken or funds skimmed from travel vouchers, is charged as an accessory in Pearson's death.

Neither of them has been charged with embezzlement; Quantico spokesman Eric Carlson said the case is under investigation. Carlson said federal investigators have so far found 18 checks totaling $15,000 in stolen funds.

Defense attorney Mark Thomas Crossland said yesterday that Reeves told him she was contacted by the two men several times from summer to December 1989 and agreed to steal for them only after they threatened her.

Reeves said she gave the money to a man she identified only as Tony, a civilian she met on the base who allegedly followed her on several occasions, Crossland said. But police said they have found no evidence of the two men and Reeves has not provided them with descriptions.