SPOKANE, Wash.—Donna Perry, formerly known as Douglas Perry, was found guilty on three counts of first degree murder Thursday morning.

The jury found Perry guilty of the murders of Yolanda Sapp, Kathleen Brisbois and Nickie Lowe.

In 1990, the women were all found shot to death near the Spokane River just weeks apart. The cases were listed as unsolved homicides until 2012 when Perry was convicted in a Texas federal court for being a felon in possession of a firearm. Her DNA was entered into a national database and linked to the victims.

The families of the murder victims say they have been waiting 27 years for the verdict. They said it brings them one step closer to closure. Chilesa Patzer's mother was Nickie Lowe's sister. Before her mother died, she said she promised she would be in court for the verdict.

"I'm just so happy that it's finally done and over with and we have some sort of closure for my aunt and these other two women. It's amazing," Patzer said.

Prosecutor said trying such an old case was not easy but they are happy with the outcome. The defense said they plan to appeal the conviction.

Perry's sentencing is scheduled for July 24 at 9:30 a.m.