Halifax Regional Police say two men are facing charges in connection with the murder of a Dartmouth teen and the stabbing of her sister.

Police responded to a report of a stabbing at 117 Pinecrest Drive in Dartmouth shortly after 11 p.m. on Jan. 8, 2011.

Officers found a 19-year-old woman inside the front doors of the apartment building. She was unresponsive and suffering from a single stab wound to her chest. Keya Knita Simon was pronounced dead at the scene.

Simon’s 32-year-old sister had also been stabbed. She was treated for non-life-threatening injuries and later released from hospital.

Police believe a fight broke out after a group of people known to the victims arrived at a party inside the apartment building.

They say the altercation spilled out onto the front lawn and that both Simon and her sister were stabbed.

Investigators arrested two suspects in connection with Simon’s homicide and her sister’s stabbing on Wednesday.

A 25-year-old Dartmouth man was arrested without incident in Dartmouth and a 25-year-old man who is originally from Dartmouth was arrested in Renous, N.B.

Demarqus Shane Beals is facing a charge of second-degree murder in connection with Simon’s death.

Carondo Shondez Downey is facing charges of aggravated assault and possession of a weapon dangerous to the public in connection with her sister’s stabbing.

Police say Beals has long been a suspect in the case but some witnesses had been withholding information. They say new information recently came to light that led investigators to lay charges.

“New information did come to light that helped us with information that we already had and we were able to bring it to a conclusion today,” says Halifax Regional Police Supt. Jim Perrin.

“I can say that investigators spoke to Miss Simon’s mother this morning and she’s of course very appreciative that we’ve got to this point.”

Beals and Downey were remanded to the Central Nova Scotia Correctional Facility overnight and appeared in Dartmouth provincial court Thursday morning.

Beals is due back in court on Sept. 22 for a preliminary hearing.

“We’ve adjourned the matter for about five weeks in order to review the file against him and make some decisions,” says defence lawyer Patrick MacEwen.

Downey is due back in court on Aug. 26 for a bail hearing and possible plea.

With files from CTV Atlantic's Ron Shaw