PORTLAND (AP) — Police in Portland are seeking information to help solve a murder mystery from 2010.

Police say Darien Richardson and Cory Girard were shot while sleeping in Richardson’s apartment on Jan. 8, 2010.

The pair were awoken by a masked intruder who entered their room and began shooting.

Richardson was shot in the hand and thigh while Girard was shot in the arm. Richardson died the following month from a pulmonary embolism caused by a blood clot that resulted from the thigh injury.

Police say they consider Richardson’s killing a murder that remains unsolved.

Her family is offering a $15,000 reward for information leading to an arrest and conviction.

Girard was later sentenced to 18 months in federal prison for possession of a firearm while being an unlawful user of controlled substances.