The brother of a Mississauga teenager who was killed last December has been charged with first-degree murder.

Waqas Parvez, 27, was originally charged with obstructing police in the death of his sister, but he has now been additionally charged with the murder count, Peel Regional Police said on Thursday.

The man's sister, 16-year-old Aqsa Parvez, died after being attacked inside their family home. She died in hospital on Dec. 10 after police said a man had called 911 and said he had killed his daughter.

An autopsy showed Aqsa died from "neck compression."

The girl's father, 57-year-old Muhammad Parvez, had his charge of second-degree murder upgraded to first-degree murder last week.

Police are not commenting on the reason for the new charges, saying only that they have resulted from their ongoing investigation.

Aqsa had been staying with friends due to a falling out with her family but returned home before school on the day she was killed.

Her friends said she had been involved in a family dispute over her choice not to wear a hijab, the traditional Muslim head scarf.

Police have not commented on a motive or how the teenager was attacked.