PORTLAND, Maine — Police in Maine’s largest city said they’re looking for new information from the public about an unsolved killing that happened 11 years ago.

Portland police said Sunday the 2010 killing of Darien Richardson by a masked intruder remains unsolved. The shooting happened in the early morning hours of Jan. 8, and Richardson’s injuries led to her death from a pulmonary embolism caused by a blot clot on Feb. 28, police said.

Richardson’s family has offered a $15,000 reward for information leading to an arrest and conviction stemming from the shooting.

Police ask anyone with information to call 207-874-8575.