RALEIGH — Police obtained a DNA sample from a Wake Forest woman charged with fatally stabbing her boyfriend at their apartment earlier this month.

Krystal Terin Delgado, 27, was arrested March 7 after police charged her with the first-degree murder of Dorian Kwame Cunningham. At about 6:15 p.m. the night before, police arrived at the couple’s apartment at 876 Main Street in Wake Forest and found Cunningham with a stab wound to the chest.

Cunningham died the next day at WakeMed in Raleigh.

Police found a knife next to Cunningham on the floor near the kitchen of the apartment, but Delgado told police she did not know how he was stabbed, according to a search warrant made public today at the Wake County Clerk of Courts Office.

Delgado told police she thought her boyfriend tripped and fell on the knife that was in a pile of clothes on the floor just inside the kitchen. She also told police she never touched the knife, according to the search warrant.

Police found a red substance they think was blood on the knife, and say that Delgado and Cunningham were the only people in the apartment when he was stabbed.

Investigators obtained a DNA sample from Delgado to compare to evidence they collected in the apartment, according to the warrant.

Delgado remains in the Wake County jail without benefit of bail, a jail spokesman said this afternoon.