2 guilty of charges related to slaying.

• Position: LOCAL NEWS

Byline: Gary V. Murray

WORCESTER - Two people are scheduled to be sentenced Oct. 27 after pleading guilty Tuesday to charges related to the shooting death last year of 21-year-old Michelle Diaz, during what prosecutors say was a marijuana robbery.

William Z. Madison, 24, and Kassie Ago, 25, both of 6 Vernon Place, entered guilty pleas in Worcester Superior Court to charges of carrying a firearm without a license, and unlawful possession of ammunition, in connection with the .38-caliber semiautomatic handgun another Worcester man allegedly used in the Aug. 24, 2010, fatal shooting of Ms. Diaz in her car on Fairfax Road. Ms. Diaz was a student at Worcester State University.

Donovan K. Smith, 18, and 28-year-old Marcus Young, identified by prosecutors as Mr. Smith's brother, are awaiting trial on murder charges in the slaying.

Mr. Smith allegedly shot Ms. Diaz in the neck and stole marijuana from her.

Prosecutors say that Mr. Madison and Ms. Ago were involved in the planning of the robbery, that Ms. Ago set up the meeting between Ms. Diaz and Mr. Smith and that Mr. Smith was armed with a handgun provided to him by Mr. Madison.

In addition to the firearm charges, Ms. Ago also pleaded guilty to a charge of being an accessory, before the fact, to armed robbery. A charge of being an accessory, before the fact, to murder is...